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Wyszukujesz frazę "81.65.-b" wg kryterium: Wszystkie pola

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    Wyświetlanie 1-57 z 57
    Tytuł:
    Enhanced Corrosion Resistance of Silicone-Coated Stents by Plasma Treatment
    Autorzy:
    Kim, H.
    Baik, K.
    Moon, M.
    Sung, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1187325.pdf
    Data publikacji:
    2016-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.65.-b
    Opis:
    The interfacial bonding of silicone-coated stents was characterized by field emission scanning electron microscopy and anodic potentiodynamic polarization tests. The coaxial in-lens secondary electron imaging revealed partial bonding between silicon rubber and nitinol alloy strips in both primer-treatment and plasma-treatment cases. Several strands between the polymer and stent substrate were observed in both cases and it seems that the bonding strength is the same. However, potentiodynamic polarization tests have shown that the corrosion rates of the plasma-treated nitinol stents were less than half of that of the primer-treated stents, indicating higher corrosion resistance. This enhanced corrosion resistance may be attributed to the modification of the physical properties of the surface of the stents by plasma treatments, making the oxide layer more effective than that of the primer-treated stents.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 4; 857-860
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of Process Parameters on Surface Behaviors of Low Carbon Steels Modified by Pulse Plasma Technique
    Autorzy:
    Agdaş, G.
    Özbek, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/1219308.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.65.-b
    Opis:
    In this study, microstructure and surface properties of low carbon steels (St52) treated by pulse plasma were investigated. The surfaces of samples were modified by pulse plasma technique. Four different plasma gun nozzle distances as 50 mm, 60 mm, 70 mm, and 80 mm and one battery capacity were chosen for surface modification. Cross-section microstructures of samples were investigated and modified layer thicknesses were measured by optical microscope. The thickness values of modified layer were obtained in a range from 10 μm to 41 μm. The samples were immersed into liquid nitrogen and then breaked in a Charpy machine. The fractured surfaces were exposed to scanning electron microscopy analyses. At the end of the study, thin grains and small tungsten grains coming from tungsten electrode were detected. After pulse plasma treatment, new structures and new phases and high hardness values were obtained.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 393-395
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pack Siliconizing of Ti6Al4V Alloy
    Autorzy:
    Celebi Efe, G.
    İpek, M.
    Bindal, C.
    Zeytin, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1031464.pdf
    Data publikacji:
    2017-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.65.Lp
    81.65.-b
    Opis:
    In this study, it was aimed to produce titanium silicide layer on Ti6Al4V by a simple, cheap and efficient method of pack siliconizing. Siliconizing was performed in a pack containing a mixture composed of SiO₂ powder as siliconizing source, pure Al powder as a reducer for siliconizing, NH₄Cl as an activator and Al₂O₃ powder as filler, at 1000°C for 8, 10 and 12 hours in open atmospheric furnace. Optical microscope and SEM-EDS studies indicate that the morphology of silicide layers has smooth, dense and layered nature. The presence of phases, confirmed by XRD analyses, reveals that the silicide layers formed at 1000°C are composed of TiSi₂, Ti₃Si₅, TiN, TiO₂ and SiO₂ compounds. Silicide layer thickness was increased with increasing process time and ranged from 7.5 to 9.0 μm. Hardness of silicide layers, measured by Vickers indentation, is over 2100 HV.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 3; 760-762
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Surface Carburizing by Valorization of Organic Waste
    Autorzy:
    Boutessouna, B.
    Allaoui, O.
    Allaoui, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1031860.pdf
    Data publikacji:
    2017-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.65.-b
    89.60.-k
    Opis:
    The organic waste recycling problem remains an important economic issue for the industry, where much research is done in this area. In this study, we are interested in the enhancement of some organic waste from slaughterhouses (blood and horns) with two objectives: recycling wastes and producing cheap cement for surface carburizing. The waste is converted into coal and added to an activator to produce a solid medium, witch can be used for surface carburizing of carbon steels. Preparation of waste and physical and chemical carbonating of blood and horns resulted in production of coal, that was used as an effective carbon source for cementation treatment. Comparison of the obtained results with other works on carburizing treatment, using industrial solid mixtures, has shown that carburizing layers in both cases are very similar. Indeed, metallographic analysis, X-ray diffraction and Vickers hardness testing of obtained layers have led to results very similar to those in literature.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 3; 1173-1175
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of Low Temperature Plasma Nitriding on Wear Resistance of Ti6Al4V Alloy
    Autorzy:
    Gul, O.
    Sari, N.
    Sinmazcelik, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1291564.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.40.Pq
    81.65.-b
    Opis:
    The effect of low temperature plasma nitriding on wear resistance of Ti6Al4V alloy were investigated. There have been several studies to investigate the low temperature plasma nitriding on Ti6Al4V alloy. Plasma nitriding processes under gas mixture of $N_2$/$H_2$ = 3 were performed at temperature 535C for duration of 4, 8 and 12 h. Adhesive wear tests were carried out by using a tribometer in block-on-ring configuration (ASTM G77), in sliding conditions, without lubricants and in air. Surface hardness of the plasma nitrided samples were measured by a Vickers hardness tester machine. Scanning electron microscopy studies were conducted to understand the wear mechanisms involved during the adhesive wear. Wear rate was calculated using weight loss per unit sliding distance. It was found that the wear resistance and surface hardness of the alloy improved considerably after plasma nitriding process. The wear resistance of the plasma nitrided samples were higher than of the unnitrided samples. Extension of nitriding times from 4 h to 12 h in the Ti6Al4V alloy improved remerkably the wear resistance and surface hardness.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 491-493
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An Investigation on Surface and Electrical Properties of Electrical Discharge Machined AISI D2 Tool Steel
    Autorzy:
    Durmus, A.
    Bayram, A.
    Gunes, S.
    Akay, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1182843.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    52.80.-s
    81.65.-b
    Opis:
    The effects of pulse-on duration and finishing operation on the surface roughness and electrical resistivity of AISI D2 tool steel machined by the electrical discharge machining process are investigated. Experimental results indicate that surface roughness increased depending on the pulse-on duration. However, after the specific value, surface roughness is decreased. It can be seen that there are no notable effects of the pulse-on duration on the electrical resistivity, but the resistivity values are affected by the heat treatment and the finishing operation. Also, light microscopy and scanning electron microscopy have been used to study the characteristics of the surfaces.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 515-517
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Treatment Techniques on Aluminum to Modify the Surface Wetting Properties
    Autorzy:
    Torrisi, L.
    Scolaro, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402312.pdf
    Data publikacji:
    2015-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.35.B-
    81.65.-b
    46.55.+d
    Opis:
    Different techniques of surface treatment are employed to modify the physical properties of aluminum surfaces. Experimental data report measurements of water wetting ability in aluminum surfaces treated with six different techniques: polishing, sanding, acid attach, laser ablation, ion implantation and nanoparticle deposition. Surfaces can be modified as a function of the different treatment parameters. Treatment duration, roughness and morphology play an important role in determining the properties from hydrophobic to hydrophilic behavior.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 1; 48-53
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Growth Characteristics of Plasma Electrolytic Oxidation Coatings on Aluminum Alloys
    Autorzy:
    Ayday, A.
    Durman, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1400565.pdf
    Data publikacji:
    2015-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.68.+m
    81.65.-b
    52.77.-j
    Opis:
    The ceramic coating on aluminum alloy was prepared in sodium metasilicate electrolyte by plasma electrolytic oxidation (PEO). The effect of PEO treating time on surface layer was investigated. The morphology and phase composition of the ceramic coatings were characterized by scanning electron microscopy (SEM) and X-ray diffractometer (XRD). The effect of the electrolyte contents on the growth mechanism, element distribution and properties of oxide layers were studied. Oxide coatings morphology is strongly dependent on PEO process time. The microdischarges characteristics were studied as well, and it is shown that size of microdischarges becomes larger with increasing time of PEO. XRD analysis showed that Plasma Electrolytic Oxidation coating has hard, dominantly Al₂O₃ phase.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 4; 886-887
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of Properties of the Laser Modified Surface Layer
    Autorzy:
    Bień, A.
    Szachnowski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/2011025.pdf
    Data publikacji:
    1999-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.40.-z
    81.65.-b
    81.70.Fy
    Opis:
    This research concerns a surface layer formed on 21H12NMFA steel with a continuous wave 6 kW CO$\text{}_{2}$ laser. The purpose of the study was the determination of the physical properties of the layer with chosen methods of identification. Electromagnetic method with a point probe has been used to determine the homogeneity in numerous points of the layer. Optic and electron (TEM) microscopy enabled the identification of the microstructure of the layer, whereas using Hanemann's meter the microhardness on the surface of the sample, and also its distribution in the layer, could be evaluated. The complex characteristic of the laser formed surface layer based on the results of the above methods of investigation is presented. The study has shown that the electromagnetically determined homogeneity of the surface layer (i.e. concerning its permeability and permittivity) can be also related to thickness, structure, and microhardness of the layer.
    Źródło:
    Acta Physica Polonica A; 1999, 96, 2; 263-273
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reciprocating Wear Behavior of Ductile Cast Iron Modified by Pulse Plasma Technology
    Autorzy:
    Ayday, A.
    Durman, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1207532.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.65.-b
    68.35.bd
    81.40.Pq
    Opis:
    Wear resistance of ductile iron can be improved through different surface engineering techniques, each having some limitations and drawbacks. Recently, a new method called pulse plasma technology has been introduced, which through local reinforcement with inserts improves wear resistance of ductile iron without compromising other properties. This paper deals with the improvement of the wear resistance of ductile iron surface modified by pulse plasma technology using a tungsten electrode. The surfaces of the samples were treated by $C_3H_8$, air, and oxygen gases. The surface morphology and the phase structure in the near surface region of original and treated samples were analyzed with optic microscope, scanning electron microscope and energy-dispersive spectroscopy. The surface properties were evaluated by measuring the microhardness, wear properties and friction coefficient, as well as the elemental depth profiles and chemical composition of the modified layer. It was found that the microhardness of the treated samples was much higher. The tribological resistances were also significantly improved, as confirmed by the reduced friction coefficient and wear track width. This improvement can be attributed to the diffusion of tungsten on the surface layer.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 189-191
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Polycarbonate Polymer Surface Modification by Extreme Ultraviolet (EUV) Radiation
    Autorzy:
    Ahad, I.
    Budner, B.
    Korczyc, B.
    Fiedorowicz, H.
    Bartnik, A.
    Kostecki, J.
    Burdyńska, S.
    Brabazon, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1197673.pdf
    Data publikacji:
    2014-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Lg
    81.40.Wx
    81.16.Rf
    81.65.-b
    Opis:
    The degree of the biocompatibility of polycarbonate (PC) polymer used as biomaterial can be controlled by surface modification for various biomedical engineering applications. In the past, PC samples were treated by excimer laser for surface reorganization however associated process alteration of bulk properties is reported. Extreme ultraviolet radiation can be employed in order to avoid bulk material alteration due to its limited penetration. In this study, a 10 Hz laser-plasma EUV source based on a double-stream gas-puff target irradiated with a 3 ns and 0.8 J Nd:YAG laser pulse was used to irradiate PC samples. The PC samples were irradiated with different number of EUV shots. Pristine and EUV treated samples were investigated by scanning electron microscopy and atomic force microscopy for detailed morphological characterization of micropatterns introduced by the EUV irradiation. Associated chemical modifications were investigated by X-ray photoelectron spectroscopy. Pronounced wall-type micro- and nanostructures appeared on the EUV modified surface resulting in a change of surface roughness and wettability.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 4; 924-928
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wear Behavior of Surface Treated X45MoCrV5-3-1 Tool Steel at Room and Elevated Temperatures
    Autorzy:
    Aktaş, G.
    Polat, Ş.
    Atapek, Ş.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401330.pdf
    Data publikacji:
    2015-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Bx
    81.65.-b
    81.40.Pq
    81.70.-q
    Opis:
    The aim of this study is to compare the wear behavior of X45MoCrV5-3-1 tool steel, used as die material in aluminum extrusion, after single treatment (CrN coating) and duplex treatment (nitriding and CrN coating). Gas nitriding and physical vapor deposition were used as processing techniques and wear tests were carried out at both room and elevated temperatures. A "ball-on-disc" type tribometer was used for room temperature tests, utilizing Al₂O₃ ball as counterpart. In order to simulate the wear conditions during extrusion, hot wear tests were carried out at 450°C using "block-on-cylinder" type tribometer against AA 6080 material. Worn surfaces were studied by microscopy to reveal the wear characteristics of treated steels. It was found that (i) duplex treated steel, having higher friction coefficient at room and elevated temperature, had higher wear resistance, (ii) at room temperature single treated steel exhibited higher volume loss than the duplex treated one, (iii) at elevated temperature duplex treated steel revealed a stable coating layer, whereas micro cracks were observed on the surface of the single treated steel.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 4; 1221-1224
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Enrichment of AISI 316L Steel Surface Layer with Rare Earth Elements Using Ion Beams
    Autorzy:
    Sartowska, B.
    Waliś, L.
    Starosta, W.
    Barlak, M.
    Pochrybniak, C.
    Kowalska, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1400431.pdf
    Data publikacji:
    2013-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    52.77.Dq
    52.77.-j
    72.15.Eb
    81.65.-b
    Opis:
    Enrichment of AISI 316L steel surface layers with rare earth elements was carried out using two methods with ion beam applying. The first one was the ion implantation with the doses in the range of $1 \times 10^{15} cm^{-2}$ up to $5 \times 10^{17} cm^{-2}$ where mishmetal (Ce+La) was used as the ion source. The second method was the high intensity pulsed plasma beams. The plasma pulses contained both ions/atoms of Ce+La from the electrodes material (mishmetal). The pulse energy densities $(3 J/cm^2)$ were sufficient to melt the near surface layer of the steel and introduce those elements into the surface layer. The aim of this work was to investigate the changes of stainless steel surface properties (morphology, rare earth elements concentration, presence of identified phases) after the rare earth elements addition with or without melting. Scanning electron microscopy, energy dispersion spectroscopy, and X-ray diffraction analysis were used for initial and modified surface characterisation. Grazing-incidence X-ray diffraction shows differences in the identified phase presence in the modified surface layer connected with the modification method.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 5; 822-824
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Extreme Ultraviolet Surface Modification of Polyethylene Terephthalate (PET) for Surface Structuring and Wettability Control
    Autorzy:
    Ahad, I.
    Fiedorowicz, H.
    Budner, B.
    Kaldonski, T.
    Vázquez, M.
    Bartnik, A.
    Brabazon, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398827.pdf
    Data publikacji:
    2016-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Lg
    81.40.Wx
    81.16.Rf
    81.65.-b
    Opis:
    The surface modification of polyethylene terephthalate (PET) polymer films has been performed by irradiation of extreme ultraviolet photons to investigate the effect of surface structuring on wettability control. For biomedical engineering applications, surface structuring and wettability control of PET films could enhance the polymer biocompatibility by promoting cell adhesion and consequently proliferation. The PET films are irradiated with laser plasma extreme ultraviolet source based on double stream gas puff target under different environments. The extreme ultraviolet modified PET film surfaces are characterized by atomic force microscopy and WCA goniometer. The extreme ultraviolet surface modification resulted in the formation of nano- and microstructuring on the polymer surfaces. The surface structuring consequently increased WCA making the PET surfaces more hydrophobic. The results demonstrate the direct relationship between surface roughness and hydrophobicity for extreme ultraviolet modified PET samples.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 2; 241-243
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of Ammoxidation Process on $NO_2$ Sorption Abilities of Active Carbons
    Autorzy:
    Nowicki, P.
    Pietrzak, R.
    Dobkiewicz, M.
    Wachowska, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1536483.pdf
    Data publikacji:
    2010-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.-t
    81.05.Rm
    81.65.-b
    89.60.-k
    Opis:
    The paper presents results of a study on obtaining N-enriched active carbons from Polish brown coal and on their use as adsorbents for removal of pollution from gas phase. The crushed precursor was subjected to carbonisation at 500, 600 and 700°C in argon atmosphere. The chars obtained were activated by KOH at 800°C. The active carbons were further subjected to the ammoxidation at 350°C for 3 h, by a mixture of ammonia and air at the ratio of 1:3. The final products were microporous active carbons of well-developed surface area reaching to 2849 $m^2$/g and pore volume to 1.49 $cm^3$/g, showing mixed acid-base character of the surface. The results have shown that a suitable choice of the carbonisation, activation and ammoxidation procedures for brown coal can lead to obtaining activated carbons with high nitrogen dioxide adsorption ability, reaching from 16.9 to 36.4 mg $NO_2$/g.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 3; 493-499
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Carbon Monolith Surface Chemistry Influence on the Silver Deposit Amount and Crystallite Size
    Autorzy:
    Vukčević, M.
    Kalijadis, A.
    Jovanović, Z.
    Laušević, Z.
    Laušević, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1503488.pdf
    Data publikacji:
    2011-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.U-
    81.65.-b
    68.35.Dv
    81.15.-z
    Opis:
    The surface of carbon monolith (CM) was chemically treated in order to obtain antibacterial filters with silver deposit for water treatment. The chemical treatment involved submerging the as-received CM in $HNO_{3},$ $KOH$ and $H_{2}O_{2}$ solution. The specific surface area was examined by $N_{2}$ adsorption. Silver deposition at the surface of CM samples was performed using cheap and simple procedure of immersing CM samples in aqueous solution of $AgNO_{3}$. Temperature programmed desorption method has been used in order to investigate the nature and thermal stability of surface oxygen groups before and after silver deposition. The composition and crystalinity of silver deposits have been examined by X-ray diffraction. Chemical treatment does not cause any drastic changes of CM specific surface area, but increases a total amount of surface oxides. Amount of deposited silver is several times higher for all chemically treated samples. The results show that increasing the amount of CO yielding groups on CM surface leads to increased amount of Ag deposit and decreases its crystallite sizes
    Źródło:
    Acta Physica Polonica A; 2011, 120, 2; 284-288
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modification of Polymer Substrates with Extreme Ultraviolet - Potential Application in Cancer Cell Identification
    Autorzy:
    Ahad, I.
    Pabijan, J.
    Pogoda, K.
    Hughes, C.
    Bartnik, A.
    Fiedorowicz, H.
    Lekka, M.
    Brabazon, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030640.pdf
    Data publikacji:
    2018-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Lg
    81.40.Wx
    81.16.Rf
    81.65.-b
    Opis:
    During the last two decades, the development of laboratory scale extreme ultraviolet sources has been intensified due to growing interest in use of extreme ultraviolet photons for various applications in science and technology. In this study, we present a potential application of extreme ultraviolet sources for surface modification of polymers to be used as substrates for cancer cell identification. The surface modification of polytetrafluoroethylene (PTFE) polymer samples was performed by a lab scale compact laser-plasma extreme ultraviolet source based on a double-stream gas-puff target. The gas target was irradiated with a 3 ns/0.8 J Nd:YAG laser pulse at 10 Hz. Reference HCV29 non-malignant transitional epithelium and T24 bladder cancer cells adhesion and proliferation studies on pure and extreme ultraviolet sources modified PTFE surfaces were performed. The extreme ultraviolet modified surfaces demonstrated regular increase in cancer cell proliferation comparing to pristine sample. Initial results indicate that extreme ultraviolet treated substrates can facilitate the identification of cancer cells.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 2; 283-285
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimization of Surface Properties of Shot Peened TI6AL4V Alloy
    Autorzy:
    Yıldıran, Y.
    Avcu, E.
    Sınmazçelik, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401227.pdf
    Data publikacji:
    2015-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    62.20.Qp
    81.65.-b
    81.05.Bx
    68.35.bd
    Opis:
    As an important surface treatment method, shot peening (SP) is widely used in automotive and aerospace industries in order to improve surface properties. In the present study SP was performed on the α-β titanium alloy Ti6Al4V under various parameters (particle impingement angle, particle acceleration pressure and particle size) by using a specially designed shot peening test rig. It is aimed to optimize surface roughness and hardness of the shot peened Ti6Al4V alloy under various parameters. In order to achieve this goal shot peened samples were investigated in detail by using a non-contact laser optical profilometer and surface hardness of the samples was measured by using a micro-hardness instrument. The surface roughness values, 3D surface morphologies and micro-hardness of the samples were obtained and examined. The results show that particle impingement angle, particle acceleration pressure and particle size dramatically affect the surface properties of the Ti6Al4V alloy.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 4; 984-986
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ion Beam Surface Modification of GaN Films for High Efficient Light Emitting Diodes
    Autorzy:
    Wu, G.
    Lin, Y.
    Tu, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1400460.pdf
    Data publikacji:
    2013-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    41.75.Ak
    81.65.-b
    42.70.Qs
    77.84.Bw
    Opis:
    Focused gallium (Ga) ion beam technology has been proposed to modify the surface of GaN thin films. Due to the significant advancement in nitride semiconductors, the solid-state light emitting diodes will gradually replace fluorescent lamps in the next decade. However, further improvements in light extraction and power efficiency are still highly desired. GaN is limited by its high refractive index, with low light escape cone angle at about 24.6°. The external quantum efficiency is low due to the unwanted reflection and absorption. As the patterning technology scales down to the nanometer level, photonic crystal lattice in the visible light wavelength range can be achieved. Therefore, we improved the external efficiency by the new design of hexagonal photonic crystal lattice with air hole arrays in the diameter of 150 nm and the depth of 120 nm. The Ga beam was accelerated at 30 kV and the ion current was 100 pA. The plane wave expansion method along with the finite difference time domain was useful to investigate the quantum confinement. The nanopatterning by the focused ion beam could save time and processing step. In addition, we have successfully prepared blue InGaN/GaN samples with hexagonal period of 200 nm. The device micro-photoluminescence results have demonstrated that the peak illumination intensity was improved by 30%.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 5; 884-887
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improved Nucleation and Transition by Plasma Treatments for Fast Response Optically-Compensated-Bend Displays
    Autorzy:
    Wu, G.
    Huang, C.
    Chien, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1400462.pdf
    Data publikacji:
    2013-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    52.77.-j
    81.65.-b
    42.79.Kr
    64.60.Q-
    Opis:
    The optically-compensated-bend mode pi-cell displays exhibit fast-response time and wide-viewing angle characteristics. However, it requires a transition of the liquid crystal molecule from an initial splay state to the bend state configuration before providing the quick operation. A high voltage and a long warm-up time are needed to transform to the bend state. In this paper, the polyimide alignment films have been modified to reduce the splay-to-bend transition time by plasma beam treatments. The proposed method was demonstrated to be highly effective in improving the overall transition time. The number of splay-to-bend nucleation sites in the assembled liquid crystal cells could be increased dramatically by up to 20 times at the initial stage, and the improvement in the cell warm-up time was achieved at 45-71% reduction at 5.5 V. The plasma processing parameters were optimized at the plasma power of 700 W, the plasma distance of 25 mm, and the plasma scan speed of 600 mm/s. In addition, we maintained the excellent optical properties and response time characteristics for the optically-compensated-bend mode liquid crystal displays.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 5; 892-895
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Corrosion Enhancement due to Plasma Post-Oxidation Subsequent to Plasma Nitriding of a Steel AISI 4140
    Autorzy:
    Muñoz-Castro, A.
    de la Piedad-Beneitez, A.
    Valencia-Alvarado, R.
    López-Callejas, R.
    Mercado-Cabrera, A.
    Peña-Eguiluz, R.
    Rodriguez-Mendez, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402190.pdf
    Data publikacji:
    2015-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    52.77.-j
    52.40.Hf
    81.40.-z
    81.65.-b
    81.65.Mq
    Opis:
    The corrosion enhancement due to plasma post-oxidation subsequent to plasma nitriding of the samples of low alloy annealed steel AISI 4140 was evaluated. The plasma nitriding was carried out at ≈570°C for 1-3 h in an atmosphere of 75% H₂ and 25% N₂. After this process post-oxidation at ≈450°C in a gas mixture, air and dry air-like was conducted for an hour. The treated samples were characterized using the XRD, SEM, AFM, potentiodynamic polarization and Vickers microhardness tests. The outcome of combined processes showed the presence of ε and γ' nitrided phases in the inner compound layer and in the outer one mostly of magnetite phase and barely visible of hematite one without using H₂ in the post-oxidation process. Also in these processes, the corrosion potential proved to be lower in the treated specimens than the untreated ones, and the corrosion current decreased up to one order of magnitude when treated in environment air and air-like ambient.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 5; 824-827
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of Impulse Shot Peening Parameters on Properties of Stainless Steel Surface
    Autorzy:
    Wiertel, M.
    Zaleski, K.
    Gorgol, M.
    Skoczylas, A.
    Zaleski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1033967.pdf
    Data publikacji:
    2017-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.65.-b
    81.20.Wk
    62.20.Qp
    61.72.-y
    78.70.Bj
    Opis:
    Shot peening was applied to austenitic stainless steel 1.4541 (EN). The surface treatment was performed at various impact energies E, impact densities j and ball diameters D. This resulted in improved microhardness, which increases monotonically with the increase of E, j and 1/D. However, its changes with E and j achieve saturation at about 400 HV0.1. On the contrary, no saturation is observed in the investigated range for 1/D. In the un-shot peened 1.4541 (EN) steel, the lifetime component of low intensity was found with use of positron annihilation lifetime spectroscopy (PALS). It corresponds to positron annihilation from delocalized state of positrons in bulk. In the shot peened samples the bulk component is no longer observed. Instead, two types of defects can be identified: vacancy-like defects coupled with edge dislocations and vacancies or their small clusters (consisting 3÷5 vacancies). The results of PALS and hardness testing do not correspond very well, especially in the case of the samples shot peened with balls of varying diameters. The most probable reason for this are different depth profiles of both methods. It seems that the defects, which are responsible for the increase of static microhardness above 400 HV0.1 are located mostly below the surface layer penetrated by positrons.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 5; 1611-1615
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of Candidate Insulating Materials for Use in Shock Wave Switches
    Autorzy:
    Kolosenok, S.
    Altgilbers, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1807885.pdf
    Data publikacji:
    2009-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    77.22.Jp
    77.80.Fm
    77.84.Lf
    81.05.Qk
    81.05.Rm
    81.65.-b
    Opis:
    One challenge in high power switching is to have a compact switch, which can hold off high voltages and close rapidly at the proper time. Most high power switches are large or complicated, such as triggered spark gaps. Typical opening switches are also not compact and often have too long switching time. It has been shown previously that certain insulating materials undergo a drastic change in conductivity under shock loading. Using such a material could greatly reduce the size of a switch. We will report on our continuing studies of different candidate materials for shock wave switches.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 6; 1010-1012
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Aluminium Morphological Modification by Nitrogen-Argon Mixture PIII
    Autorzy:
    Muñoz-Castro, A.
    López-Callejas, R.
    Valencia Alvarado, R.
    Peña-Eguiluz, R.
    Mercado-Cabrera, A.
    Barocio, S.
    Rodríguez-Méndez, B.
    de la Piedad-Beneitez, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1504099.pdf
    Data publikacji:
    2011-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    52.40.Hf
    52.77.Dq
    81.65.-b
    61.05.cp
    62.20.Qp
    68.37.Hk
    Opis:
    With incident fluences of ≈ $10^{12}$ atoms/$cm^2$ aluminium samples have been plasma immersion ion implanted with either pure nitrogen or argon/nitrogen mixtures at temperatures around 450°C. X-ray diffraction studies have validated the formation of the cubic phase of AlN, in samples treated with both the gas mixtures and pure nitrogen. Likewise, the presence of the hexagonal phase of AlN has been detected when either pure nitrogen or a 70%N/30%Ar mixture have been used. The signature peak of AlN has also been confirmed by the Raman spectroscopy. The maximal microhardness values were found in samples treated with the mixture. The maximal roughness was achieved with the equal part mixture in all cases, although increasing with the implantation pulse width up to a 300 nm peak at 150 μs. The latter critical value remains invariant under the pure nitrogen plasma treatment, provided that implantation periods in the order of 4.5 h are carried out.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 1; 167-170
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characterization of Fe-Nb-B Base Hardfacing of Steel
    Autorzy:
    Kilinc, B.
    Cegil, O.
    Abakay, E.
    Sen, U.
    Sen, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1311693.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.65.Kn
    68.55.J-
    81.65.Lp
    Opis:
    Recently hardfacing by welding has become a commonly used technique for improvement of material performance in extreme (high temperature, impact/abrasion, erosion, etc.) conditions. In the present study, three different alloy compositions of the Fe-Nb-B were used for hardfacing of the AISI 1020 steel by tungsten inert gas welding process and analyzed. The coatings were produced from a mixture of ferrous niobium, ferrous boron and iron powders in the range of - 45 μm particle size with different ratio. The coatings' thickness was set to 2-3 mm on the substrate. Microstructure, phase analysis and hardness of the manufactured hardfacing alloys were characterized. Deposition results indicate good quality thick coating and porosity free of the hardfacings. X-ray diffraction analyses showed that the alloyed layers include iron borides, FeNbB and iron phases. It was shown that surface alloyed layer has composite structure including steel matrix and well distributed boride phases.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 656-658
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Physical-Chemical Analysis of Miter Glass Element Decoration
    Autorzy:
    Greiner-Wronowa, E.
    Kalfas, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1418364.pdf
    Data publikacji:
    2012-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.40.Np
    81.65.Kn
    Opis:
    This paper refers to the glass elements, belonging to the XIIIth c. miter, called Saint Stanisław from the Wawel Cathedral Museum in Kraków. The miter so-called Saint Stanisław, has been one of small number preserve miters preserved in Europe, and only one Romanesque style bishop miter in Poland. According to decoration composition is very close to the miter of Calvo bishop (1180-1243) from Diocese Museum in Vic. There were decorative motives, created by embroidering by blue glass beads, and surrounding them by gold thread. The exposition conditions have had fundamental meaning on the miter stage. The glass elements from St. Stanisław's miter were analyzed to solve problem of the place of the miter exposition. It was realized by estimation of glass corrosion category. Moreover, obtained data could help to confirm the hypothesis of displaying it on the altar, which was expected by the historians to their historical documentation. That kind of the XIIIth c. material analyses have never been done before.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 4; 781-787
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wear Properties of TIG Surface Alloyed Steel with 50%Fe-10%W-40%B Alloy
    Autorzy:
    Abakay, E.
    Kilinc, B.
    Sen, S.
    Sen, U.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401223.pdf
    Data publikacji:
    2015-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.20.Vj
    81.05.Bx
    81.40.Pq
    81.65.Lp
    Opis:
    In the present study, AISI 1020 plain carbon steel was surface alloyed with preplaced 50%Fe-10%W-40%B alloying powders using a tungsten-inert gas (TIG) heat source. Microstructure, hardness, and wear resistance of the surface alloyed layer were investigated. Following the surface alloying, conventional characterization techniques such as optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), and X-ray diffraction analysis (XRD) were used to study the phase and microstructural examinations of the alloyed surfaces. Hardness measurements were performed across the alloyed zones, and wear properties of the alloyed surfaces were evaluated using a ball-on-disc wear test method. Hardness values of the phases formed in the alloyed layer are changing between 620±30 $HV_{0.1}$ and 2095±254 $HV_{0.1}$. The major phases formed in the surface alloyed layer were Fe₂B, FeB and FeW₂B₂. Wear test were realized against Alumina ball under the loads of 2.5 N, 5 N and 10 N at the sliding speed of 0.1 m/s for 250 m sliding distance. The friction coefficient of the 50%Fe-10%W-40%B alloyed steel surface is changing between 0.70 and 0.79 depending on applied loads. The wear rates of the surface alloyed steel ranged from $4.01 \times 10^{-5}$ mm³/m to $4.14 \times 10^{-4}$ mm³/m.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 4; 957-960
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Corrosion Behavior of Nitride and Cr-Al-N Coatings Formed on AISI D2 Steel
    Autorzy:
    Kılınc, B.
    Demirkiran, S.
    Sen, U.
    Sen, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399749.pdf
    Data publikacji:
    2013-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.65.Kn
    68.55.J-
    81.65.Lp
    Opis:
    In the present work, the corrosion behavior of Cr-Al-N coating formed on the pre-nitrided AISI D2 cold work tool steel by thermo-reactive diffusion technique in the powder mixture consisting of ferro-chromium, aluminum, ammonium chloride and alumina at 1000C for 2 h was investigated. The phases formed in the coating layers were $Cr_2N$, $(Cr,Fe)_2N_{1-x}$, $AlN$, and $Fe_2N$ which were confirmed by X-ray diffraction analysis. The uncoated, nitrided, and Cr-Al-N coated specimens were placed in corrosive media (3.5 wt% salt solution). A standard saturated calomel electrode was used as a reference and graphite as a counter or auxiliary electrode. The effectiveness of the coatings in preventing corrosion was tested in the NaCl solution by electrochemical impedance studies using the Nyquist plots and potentiodynamic studies as well. Conclusively, the application of nitride and Cr-Al-N layers on AISI D2 steel increased its surface hardness and corrosion resistance. The corrosion resistance of Cr-Al-N coatings is higher than that of uncoated and nitrided steels.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 2; 268-270
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Lattice Parameters of Aluminium Nitride in the Range 10-291 K
    Autorzy:
    Paszkowicz, W.
    Knapp, M.
    Podsiadło, S.
    Kamler, G.
    Pełka, J. B.
    Powiązania:
    https://bibliotekanauki.pl/articles/2030706.pdf
    Data publikacji:
    2002-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Je
    65.40.De
    65.60.+a
    65.40.-b
    Opis:
    Lattice parameters for aluminium nitride were determined using X-ray powder diffraction at a synchrotron radiation source (beamline B2, Hasylab/DESY, Hamburg) in the temperature range from 10 K to 291 K. The measurements were carried out using the Debye-Scherrer geometry. The relative change of both, a and c, on rising the temperature in the studied range (10-291 K) is about 0.03%. The results are compared with earlier laboratory data and theoretical predictions.
    Źródło:
    Acta Physica Polonica A; 2002, 101, 5; 781-785
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of the Silanization Processes on the Properties οf Oxidized Multiwalled Carbon Nanotubes
    Autorzy:
    Scheibe, B.
    Borowiak-Palen, E.
    Kalenczuk, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1807640.pdf
    Data publikacji:
    2009-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.65.Mq
    81.07.De
    61.48.De
    65.80.-g
    68.37.Lp
    Opis:
    This paper presents the results of the research on the effect of the two different silanization methods on the thermal and structural properties of oxidized multiwalled carbon nanotubes. As-purified material was oxidized in the mixture of nitric and sulfuric acids. An oxidized material was divided into two parts which underwent two silanization treatments by 3-aminopropyltriethoxysilane (APTES). The first experiment (I) was performed at room temperature in acetone (pH 7) for 30 min. The second experiment (II) involved a hydrolysis of APTES at 40°C in water (pH 4) for 3 h. The functionalization extent of the samples at each step of the preparation was investigated by the Raman spectroscopy. The presence of the functional groups on the nanotubes surface have been studied via the Fourier transform infrared spectroscopy (FT-IR). The quantity of the external moieties introduced on multiwalled carbon nanotubes surface after oxidation process was estimated by the Boehms titration method. The high resolution transmission electron microscopy analysis allowed us to observe the changes of the morphology of the investigated carbon nanotubes. The influence of the silanization processes on the thermal stability of multiwalled carbon nanotubes was thoroughly studied by thermogravimetry analysis. There was observed a significant increase of the thermal stability of the multiwalled carbon nanotubes samples upon silanization treatment in respect of pristine and oxidized multiwalled carbon nanotubes.
    Źródło:
    Acta Physica Polonica A; 2009, 116, S; S-150-S-155
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Cathodic Electrolytic Plasma Hardening of Steel and Cast Iron Based Automotive Camshafts
    Autorzy:
    Dayanç, A.
    Karaca, B.
    Kumruoğlu, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030309.pdf
    Data publikacji:
    2017-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.65.Lp
    82.45.Hk
    81.40.Pq
    Opis:
    Cathodic electrolytic plasma hardening is a novel thermochemical surface modification and hardening process, used to increase wear resistance and surface hardness of metallic components in a local area of interest. The heating efficiency is related with the plasma nozzle design, applied current and electrolyte. The nozzle design is also a critical factor for the hardening of complex shapes, such as gears and camshafts. In this work, lobes of camshafts, fabricated from several cast iron and steel grades were hardened by cathodic electrolytic plasma hardening in aqueous carbonate electrolyte, using a specific plasma nozzle. The camshafts were attached to CNC lathe for turning them in the horizontal axis. In order to optimise heating and to achieve the ideal flowing and wetting by the electrolyte of the lobe case, the ceramic ellipse-shaped nozzle outlet was designed. As a result of preliminary studies, external surface of lobes was heated and subsequently quenched by electrolyte. The hardness of processed surface was in the range of 50-60 HRc for the different camshafts. No distortion was observed on the surface of lobes. Hardness depth was measured to be from 0.1 mm to 5 mm for several lobes.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 3; 374-378
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Revealing Prior-Austenite Grain Boundaries and Martensitic Structure of As-Quenched AISI 4140 Steel Treated by Plasma Electrolysis
    Autorzy:
    Cenk Kumruoglu, L.
    Özel, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399956.pdf
    Data publikacji:
    2013-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.40.Gh
    81.40.-z
    81.65.Cf
    52.50.-b
    Opis:
    The determination of prior-austenite grain size has been the subject of metallurgical research efforts for many years. Metallurgical laboratories are often required to perform prior-austenite grain size determinations on martensitic steel components that have been heat treated. Although these methods may occasionally be mandated by material or procedural specifications, they are typically not preferred because they have a tendency of altering the as-received microstructure. These processes can also be labour-intensive and costly. The goal of this work is to chemically etch and identify the prior austenite grain size and martensitic structure of AISI 4140 steel treated by plasma electrolysis. Polished samples were immersed in 60% HCl, 30% $HNO_3$, 5% HF, 5% $H_2O$ for 5 seconds then immersed in 5% picric acid, 5% HCl, 90% ethanol to reveal microstructures. Finally, the grain boundary and lath martensitic structure were revealed.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 2; 404-406
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Corrosion Properties of CrAlN and TiAlN Coatings Deposited by Thermoreactive Deposition Process
    Autorzy:
    Cegil, O.
    Kılınc, B.
    Sen, S.
    Sen, U.
    Powiązania:
    https://bibliotekanauki.pl/articles/1194669.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    82.45.Bb
    81.65.Kn
    81.15.-z
    Opis:
    In the present study, the corrosion behaviors of chromium aluminum nitride (CrAlN) and titanium aluminum nitride (TiAlN) coatings deposited on AISI D2 steel samples are reported. Steel samples were pre-nitrided at 575C for 8 h in the first step of the coating process, and then TiAlN and CrAlN coatings were performed by thermoreactive deposition process in a powder mixture consisting of alumina, ammonium chloride, aluminum and ferrous titanium or ferrous chromium for TiAlN or CrAlN, respectively. Coating treatments were realized at 1000C for 2 h. Coated samples were characterized by X-ray diffraction analysis, optical microscopy, scanning electron microscopy, and microhardness tester. The corrosion properties of uncoated and coated samples were characterized by potentiostatic polarization test. CrAlN and TiAlN coated steel specimens exhibited the higher corrosion resistance than uncoated steels in a 0.5 M NaCl solution.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 359-361
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Three-Dimensional Simulations of the Anisotropic Etching Profile Evolution for Producing Nanoscale Devices
    Autorzy:
    Radjenović, B.
    Radmilović-Radjenović, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1505422.pdf
    Data publikacji:
    2011-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.65.Cf
    Opis:
    Refined control of etched profiles is one of the most important tasks of micro (nano) electro mechanical systems manufacturing process. In spite of its wide use, the simulation of etching for micro (nano) electro mechanical systems applications has been so far a partial success only, although a great number of commercial and academic research tools dedicated to this problem are developed. In this paper we describe an application of the sparse field method for solving level set equations in 3D anisotropic wet etching of silicon with potassium hydroxide (KOH). Angular dependence of the silicon etching rate is determined on the basis of the silicon crystal symmetry properties. Some examples illustrating developed methodology are given.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 3; 447-450
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Optical Properties of CuInSe$\text{}_{2}$ Thin Films
    Autorzy:
    Fouad, S. S.
    Youssef, S. B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1920947.pdf
    Data publikacji:
    1992-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.65.-s
    81.40.Tv
    Opis:
    The optical constants of vacuum deposited CuInSe$\text{}_{2}$ thin films of different thicknesses (60-135 nm) were determined in the photon energy from 1.03 to 3.1 eV. It was found that both the refractive index n and the absorption index k are independent of the film thickness. The analysis of the experimental points of the refractive index revealed the existence of normal dispersion and fits Sellmeier dispersion formula for single oscillator model. Using the previous model the optical dielectric constant as well as the oscillator energy and dispersion parameter have been calculated. CuInSe$\text{}_{2}$ is found to be a direct gap semiconductor with a gap energy of 1.03 eV. At energies well above the absorption edge, the absorption behaviour can be explained by the existence of a forbidden direct transition with the same direct energy gap and an indirect one with energy gap of 0.85 eV.
    Źródło:
    Acta Physica Polonica A; 1992, 82, 3; 495-501
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Intermittency and Deformation Band Propagation in an Austenitic FeMnC TWIP Steel
    Autorzy:
    Lebyodkin, M.
    Lebedkina, T.
    Roth, A.
    Allain, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1418489.pdf
    Data publikacji:
    2012-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    62.20.F-
    81.70.-q
    05.65.+b
    62.65.+k
    Opis:
    Plastic deformation of austenitic FeMnC TWIP steels exhibits complex spatiotemporal patterns associated with the occurrence of deformation bands and the concomitant fluctuations of the deforming stress. Although the plastic instability is a generic property of these steels and is usually attributed to interaction of dislocations with solutes (the Portevin-Le Chatelier effect), both the kinematics of the deformation bands and the characteristic shape of stress serrations observed in the carbon-containing TWIP steel at room temperature manifest unusual features. The nature of these peculiarities and the mechanism of jerky flow in such steels are unclear. In the present work, an attempt is made to get an insight into the jerky flow in the Fe22Mn0.6C steel by studying the time series characterizing the evolution of plastic deformation at various scales: stress-time curves, local strain field, and acoustic emission accompanying the deformation processes. Stress and strain fluctuations related to two distinct scale ranges are detected and characterized.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 3; 478-481
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Transport Through a Single-Molecule Transistor: Master-Equation Approach
    Autorzy:
    Donabidowicz-Kolkowska, A.
    Timm, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1431179.pdf
    Data publikacji:
    2012-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.23.Hk
    73.63.-b
    81.65.+h
    Opis:
    In the present work we employ the master-equation approach to describe the transport through a molecule located in the central region between two external electrodes. In contrast to the transport through a quantum dot, electron-phonon coupling should be taken into account for tunnelling through a molecule. The coupling results in the appearance of additional effects such as vibrational sidebands or, for the case of strong coupling, a suppression of the current at low bias voltage (Franck-Condon blockade). In contrast to previous studies, the transport properties are described by the density matrix calculated explicitly with diagonal and off-diagonal elements. The observed phenomena are discussed and compared to previous studies.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 4; 730-732
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phase Composition of the Surface Zone of Nitrided Cast Steels and Their Mechanical Properties
    Autorzy:
    Brzózka, K.
    Budzynowski, T.
    Górka, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1506569.pdf
    Data publikacji:
    2011-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.66.Dk
    81.65.Lp
    81.40.-z
    76.80.+y
    61.05.cp
    68.37.-d
    81.40.Pq
    Opis:
    Conversion electron Mössbauer spectroscopy and structural X-ray diffractometry have been used to study nitrides formation in the surface layer of cast steels subjected previously to low-temperature nitriding. It has been found that creation of iron-nitrogen phases strongly depends on sample composition. Nitrides: $γ^\prime-Fe_{4}N$ and $\epsilon-Fe_{2-3}N$ arise in the course of the nitriding procedure in most investigated cast steels. Moreover, considerable changes in their microstructure and tribological properties occur. The depth profile of nitrides has been derived for selected cast steel.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 1; 28-32
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wear Behavior of TiAlN and CrAlN Coatings Deposited by TRD Process on AISI D2 Steel
    Autorzy:
    Kılınc, B.
    Cegil, O.
    Sen, S.
    Sen, U.
    Powiązania:
    https://bibliotekanauki.pl/articles/1219208.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.15.-z
    46.55.+d
    81.65.Lp
    Opis:
    The wear properties of uncoated, chromium aluminum nitride (CrAlN) and titanium aluminum nitride (TiAlN) coated AISI D2 steel were investigated and compared using ball-on-disc method at 0.3 m/s sliding speed and under the loads of 2.5 N, 5 N, and 10 N against $Si_3N_4$ ball as a counter material. Steel samples were nitrided at 575C for 8 h in the first step of the coating process, and then titanium aluminum nitride coating and chromium aluminum nitride were performed by thermoreactive deposition (TRD) process at 1000C for 2 h. Coated samples were characterized by X-ray diffraction analysis, scanning electron microscopy, microhardness, and ball on disk wear tests. The results of friction coefficient and wear rate of the tested materials showed that the TiAlN coating presents the lowest results.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 362-364
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The law of growth of nitrided layer in 31CrMoV9 steel
    Autorzy:
    Syla, N.
    Aliaj, F.
    Dalipi, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1068250.pdf
    Data publikacji:
    2016-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.05.cp
    81.65.Lp
    Opis:
    The law of growth of nitrided layers produced by gaseous nitriding of 31CrMoV9 alloy steel at different process parameters is described. 31CrMoV9 steel specimens were subjected to nitriding process in ammonia gas at three different temperatures: 510, 550 and 590°C, and for each temperature four different nitriding times were used. This way twelve specimens were produced. Nitrided specimens were investigated with optical microscopy, electron probe micro-analysis and x-ray diffraction. The nitrogen depth concentration profiles, deduced from electron probe micro-analysis, in conjunction with results of optical microscopy, were used to determine the thickness of the nitrided layers, i.e. the diffusion depth of nitrogen. From the dependence of the nitrided layer thickness on process parameters (temperature and time) it was possible to deduce the law that governs the growth of the nitrided layer for 31CrMoV9 alloy steel. Through this law, then, it is possible to predetermine the layer thickness for every real process parameter in nitriding of 31CrMoV9 steel, which is very important for technological applications.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 1; 83-86
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Properties of Cr-Al-N Based Coatings Formed on AISI D2 Steel by Thermo-Reactive Diffusion Technique
    Autorzy:
    Kılınc, B.
    Sen, U.
    Sen, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399772.pdf
    Data publikacji:
    2013-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.15.-z
    62.20.Qp
    68.55.J-
    81.65.Lp
    Opis:
    In this study, chromium aluminum nitride coating was applied on pre-nitrided AISI D2 steel by the thermo-reactive deposition technique in a powder mixture consisting of ferrochromium, aluminum, ammonium chloride, and alumina at 1000C for 2 h. Steels were gas nitrided for the purpose to enrich the surfaces with nitrogen of the steels in a nitrogen and ammonia atmosphere at 560C for 8 h. The effect of aluminum content in the powder mixture on the Cr-Al-N layer properties was investigated. The coated samples were characterized by X-ray diffraction analysis, scanning electron microscope, and micro-hardness tests. Chromium aluminum nitride layer formed on the pre-nitrided AISI D2 steel was compact and homogeneous. Electron dispersive spectrometer results showed that coating layer includes chromium, aluminum, and nitrogen. X-ray studies showed that the phases formed in the coating layers on the steel surfaces are $Cr_2N$, $(Cr,Fe)_2N_{1-x}$, $AlN$, and $Fe_2N$. The depth of the Cr-Al-N layer ranged from 10.01 ± 1.2 to 13.2 ± 1.7 μm, depending on the aluminum content. The hardness of the coated layers produced on AISI D2 steel are changing from 1743 ± 150 $HV_{0.01}$ to 2067 ± 160 $HV_{0.01}$ depending on bath compositions.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 2; 271-273
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fabrication of High-Density GaN Nanowires through Ammoniating $Ga_2O_3//Nb$ Films
    Autorzy:
    Zhuang, H.
    Li, B.
    Zhang, S.
    Zhang, X.
    Xue, Ch.
    Wang, D.
    Shen, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813498.pdf
    Data publikacji:
    2008-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.65.-k
    81.05.Ea
    81.15.Cd
    Opis:
    High-density GaN nanowires were successfully synthesized on Si(111) substrates through ammoniating $Ga_2O_3//Nb$ films under flowing ammonia atmosphere at 950°C. The as-synthesized GaN nanowires are characterized by X-ray diffraction, selected-area-electron diffraction, Fourier transform infrared, scanning electron microscopy, and field-emission transmission electron microscopy. The results show that the synthesized nanowires are single-crystal hexagonal wurtzite GaN with diameters ranging from 30 to 100 nm and lengths up to several microns. The photoluminescence spectra measured at room temperature only exhibit a strong and broad emission peak at 367.8 nm. Finally, the growth mechanism of GaN nanowires is discussed.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 2; 723-730
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of second harmonic generation in KDP/Al₂O₃ crystalline nanocomposite
    Autorzy:
    Andrushchak, N.
    Kulyk, B.
    Göring, P.
    Andrushchak, A.
    Sahraoui, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1052895.pdf
    Data publikacji:
    2018-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.07.Bc
    61.46.Df
    68.37.Ps
    42.65.Ky
    Opis:
    Crystalline nanocomposite KDP/Al₂O₃ was obtained by growth of KDP nanocrystals inside nanopores of amorphous alumina matrix (Al₂O₃) with pores diameter of 35 nm. Performed atomic force microscopy and X-ray diffraction analysis confirmed that Al₂O₃ matrix is filled up with a tetragonal phase KDP nanocrystals in preferred crystallographic orientation [100]. The nonlinear optical response was studied by means of second harmonic generation via the Maker fringe technique employing picosecond laser pulses at wavelength of 1064 nm. The polarization dependent second harmonic generation response was observed mainly due to the macroscopic crystalline structure anisotropy of KDP/Al₂O₃ nanocomposite. The investigation of such type of nanocomposites which combine nanoscale nonlinear optical materials has a great importance since they may improve the performance of entire system.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 4; 856-859
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructure Development in Multilayer $TiB_x // TiSi_y C_z$ Coatings during Post-Deposition Heat Treatment
    Autorzy:
    Twardowska, A.
    Rajchel, B.
    Morgiel, J.
    Mędala-Wójcik, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398372.pdf
    Data publikacji:
    2016-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.15.Cd
    81.20.-n
    42.62.-b
    61.43.Dq
    68.37.-d
    68.37.Lp
    68.65.Ac
    64.70.Kb
    Opis:
    Multilayer amorphous $TiB_{x} // TiSi_{y}C_{z}$ coatings were formed by duplex treatment: dual beam ion beam assisted deposition and pulsed laser deposition. Post-deposition heating was applied to activate crystallization in the coating. In situ transmission electron microscopy heating experiments were conducted in the temperature range 20-600°C. Crystallization of TiB₂ phase in $TiB_{x}$ layers begun at 450°C, while $TiSi_{y}C_{z}$ layers retained nearly amorphous up to 600°C.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 4; 1124-1126
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    PeakForce Tapping Technique for Characterization of Thin Organic Passivating Layers
    Autorzy:
    Papis-Polakowska, E.
    Radkowski, B.
    Lesko, S.
    Kaniewski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1198431.pdf
    Data publikacji:
    2014-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    07.79.Lh
    64.75.Yz
    81.65.Rv
    Opis:
    The PeakForce Tapping technique was used for study of GaAs and GaSb surfaces treated by hexadecanethiol (HDT) - the sensitive self-assemble compound. The results of both surface morphology control and electrical properties characterization have been presented.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 4; 1056-1060
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of deformation on the transformation temperatures of martensite and bainite structures in Cu-9.97%Al-4.62%Mn alloy
    Autorzy:
    Aldirmaz, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1075528.pdf
    Data publikacji:
    2016-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.66.Dk
    68.37.Hk
    81.30.Kf
    81.30.Mh
    62.20.-x
    65.40.-b
    Opis:
    At present study of Cu-9.97%Al-4.62%Mn alloy system is used. Some physical properties of martensitic and bainite phase transformatios in Cu-9.97%Al-4.62%Mn (wt%) alloy were investigated by means of scanning electron microscopy and differential scanning calorimetry. In scanning electron microscope observations of Cu-9.97%Al-4.62%Mn alloy were noted two kinds of martensitic phases. These phases were defined as β'₁ (M18R) and γ'₁ (2H) martensites structures. According to differential scanning calorimetry measurement results, the deformation induced temperature is expected to be higher than the thermally induced temperature in Cu-9.97%Al-4.62%Mn alloy for martensite and bainite structures.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 1; 40-42
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Growth of β-$Ga_2O_3$ Nanorods and Photoluminescence Properties
    Autorzy:
    Zhang,, S.
    Zhuang, H.
    Xue, C.
    Li, B.
    Shen, J.
    Wang, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1814023.pdf
    Data publikacji:
    2007-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.65.-k
    79.60.Jv
    81.15.Cd
    Opis:
    β-$Ga_2O_3$ nanorods were successfully fabricated through annealing $Ga_2O_3$/Mo films deposited on the Si (111) substrate by radio frequency magnetron sputtering technique. The morphology and structure of the as-synthesized nanorods were characterized by X-ray diffraction, scanning electron microscopy, high-resolution transmission electron microscopy, and energy dispersive X-rays spectroscopy. The results show that the formed nanorods are single-crystalline $Ga_2O_3$ with monoclinic structure. The diameters of nanorods are 200 nm and lengths typically up to several micrometers. A photoluminescence spectrum at room temperature under excitation at 325 nm exhibits two strong blue-light peaks located at about 413.0 nm and 437.5 nm, attributed to the recombination of bound electron-hole exciton in β-$Ga_2O_3$ single crystal. The growth process of the β-$Ga_2O_3$ nanorods is probably dominated by conventional vapor-solid mechanism.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 6; 1195-1201
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative Morphological Analysis of Graphene on Copper Substrate obtained by CVD from a Liquid Precursor
    Autorzy:
    Weiss, M.
    Walkowiak, M.
    Wasiński, K.
    Półrolniczak, P.
    Kokocińska, B.
    Strupiński, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032380.pdf
    Data publikacji:
    2017-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.65.Pq
    81.05.ue
    Opis:
    Graphene film has been produced on untreated Cu substrate by a chemical vapor deposition technique in ambient pressure with liquid ethanol serving as the carbon precursor. The obtained material has been subjected to morphological study, directly on Cu substrate, by means of optical microscopy, scanning electron microscopy, atomic force microscopy, and a detailed Raman analysis. As a benchmark material, graphene obtained on Cu by a conventional CVD from gaseous methane was used. This simple experimental setup has proved to enable obtaining large area graphene samples with nearly 100% substrate coverage and large domains of one carbon layer. As compared to graphene from gaseous precursor, the presented approach resulted in visibly more defects and impurities. These imperfections are due to more complex precursor molecular structure and lack of Cu pretreatment with hydrogen, the later cause being easy to eliminate in course of further optimization of the method. The described approach can be regarded as a viable, low-cost, and experimentally simple alternative for the existing techniques of producing large area graphene. By providing direct comparison with the conventional method, the paper's intention is to provide deeper insight and to fill gap in the understanding of mechanisms involved in graphene formation on copper.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 6; 1497-1506
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of the Temperature Dependent Thermal Expansion Coefficients of Bulk AlN by HRXRD
    Autorzy:
    Kröncke, H.
    Figge, S.
    Hommel, D.
    Epelbaum, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811948.pdf
    Data publikacji:
    2008-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    01.30.Cc
    61.05.cp
    81.05.Ea
    65.40.De
    Opis:
    We measured the lattice constants of bulk aluminum nitride crystals at various temperatures by high resolution X-ray diffraction. By the use of a high temperature chamber and a X-ray cryostat a temperature regime from 20 to 1210 K was available. Furthermore, the measured data were fitted by Einstein- and Debye models which yield reliable parameters for the calculation of the thermal expansion coefficients of AlN.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 5; 1193-1200
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ferroelastic Phase Transition in a Layered Bismuth Oxychloride Single Crystals
    Autorzy:
    Bunda, V.
    Bunda, S.
    Vashchuk, F.
    Feher, A.
    Kajňaková, M.
    Kováč, J.
    Syrkin, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1535538.pdf
    Data publikacji:
    2010-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    64.70.K-
    81.30.-t
    65.40.-b
    Opis:
    We report the results of low-temperature specific-heat, magnetization, and X-ray diffraction measurements on a bismuth oxyhalide (BiOCl) single crystal. We conclude that BiOCl in temperature region 150-230 K shows "antiferroelastic-paraelectric" phase transitions at critical temperatures $T_{c1}$ = 167.5 K and $T_{c2}$ = 214.6 K, respectively.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 5; 1069-1070
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of Si-Implanted and Thermally Annealed Layers of Silicon by Using X-ray Grazing Incidence Methods
    Autorzy:
    Klinger, D.
    Lefeld-Sosnowska, M.
    Pełka, J. B.
    Paszkowicz, W.
    Gierłowski, P.
    Pankowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2030709.pdf
    Data publikacji:
    2002-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.10.-i
    61.10.Kw
    61.72.Tt
    68.35.Fx
    81.40.Ef
    81.65.Mq
    Opis:
    This paper reports on the study of structural modifications induced by the implantation process and by the subsequent thermal annealing in near-surface layers of Si single crystals implanted with Si$\text{}^{2+}$ ions of energy 140 keV and doses from 1×10$\text{}^{15}$ to 1× 10$\text{}^{16}$ ions/cm$\text{}^{2}$. The grazing incidence X-ray diffraction and X-ray reflectivity measurements were applied to determine the thickness and structural composition of the damaged layers. The fitted electron density profiles indicated an existence of an interfacial layer with density higher than the density of Si matrix or near-surface oxide layer. Formation of polycrystalline phases of silicon and silicon oxides is discussed in dependence on the conditions of annealing treatment and implantation dose.
    Źródło:
    Acta Physica Polonica A; 2002, 101, 5; 795-801
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal Behavior and Crystallization of $Fe_{81 - x}Co_{x}Zr_7Nb_2B_{10}$ (x = 2, 4, 6) Alloys
    Autorzy:
    Yu, W.
    Sun, Y.
    Liu, L.
    Dong, L.
    Hua, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1492773.pdf
    Data publikacji:
    2011-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    65.60.+a
    61.43.Dq
    Opis:
    Thermal behavior and microstructure of $Fe_{81 - x}Co_{x}Zr_7Nb_2B_{10}$ (x = 2, 4, 6) alloys were investigated by differential thermal analysis and X-ray diffraction. Both the supercooled liguid region Δ $T_{x}$ and the first crystallization peak temperature $T_{p1}$ are the lowest and the span Δ $T_{p}$ between $T_{p1}$ and $T_{p2}$ is the highest when 4 at.% Fe is substituted by Co. The crystallization activation energy $E_{p1}$ for $Fe_{75}Co_6Zr_7Nb_2B_{10}$ alloy is the minimum for the heating rates ν = 5-20 K/min. $E_{p1}$ for $Fe_{77}Co_4Zr_7Nb_2B_{10}$ alloy is the minimum for the heating rates ν = 20 - 50 K/min. The crystallization processes of $Fe_{81 - x}Co_{x}Zr_7Nb_2B_{10}$ (x = 2, 4, 6) amorphous alloys are similar on the whole, which is as follows: amorphous → amorphous + α-Fe(Co) → α-Fe(Co) + $Fe_3Zr$ + $Fe_2Nb_{0.4}Zr_{0.6}$.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 6; 1034-1036
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Macroscopic and Microscopic Descriptions of the Plastic Deformation of Fcc Metals over a Wide Range of Strain and Temperature
    Autorzy:
    Csanádi, T.
    Chinh, N.
    Gubicza, J.
    Langdon, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1419113.pdf
    Data publikacji:
    2012-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.66.Bi
    83.50.Uv
    65.40.-b
    81.40.Jj
    61.72.Cc
    Opis:
    The plastic behavior of face-centered cubic metals was investigated over a wide range of strain and testing temperature. The experimental stress-strain data were described using both macroscopic and microscopic, well-established relationships. The characteristics of these descriptions are discussed and compared with each other. The analysis of the characteristics leads to a definition of the low and high temperature deformation regions, where the kinetics of both the dislocation-multiplication and the dislocation-annihilation (recovery) are different. For pure aluminum, it is shown that the boundary between these two regions occurs at a homologous temperature of the order of $\approx 0.5 T_{m}$ where $T_{m}$ is the absolute melting temperature. From this analysis, correlations are also drawn between the macroscopic parameters describing the stress-strain relationship and the fundamental characteristics of the microscopic processes both at room temperature and elevated temperatures.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 3; 630-633
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure and Composition of Scales Formed on AISI 316 L Steel Alloyed with Ce/La Using High Intensity Plasma Pulses after Oxidation in 1000°C
    Autorzy:
    Sartowska, B.
    Piekoszewski, J.
    Waliś, L.
    Barlak, M.
    Starosta, W.
    Pochrybniak, C.
    Bocheńska, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1503944.pdf
    Data publikacji:
    2011-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    52.77.-j
    72.15.Eb
    81.65.Mq
    Opis:
    It is well documented that the high oxygen affinity elements such as Y, Ce, La, Er and other rare earth elements added to steel in small amounts can improve their high temperature oxidation resistance. Rare earth elements can be either alloyed during the steel making process or introduced through surface treatment techniques. Improvement of high temperature oxidation resistance of AISI 316 L steel by incorporation Ce and La elements into its near surface region using high intensity pulsed plasma beams in so-called deposition by the pulse erosion mode was investigated in the present work. The samples were irradiated with 3 short (μs scale) intense (energy density $3 J//cm^2$) plasma pulses. Heating and cooling processes occur under non-equilibrium conditions. In all samples the near surface layer of the thickness in μm range was melted and simultaneously doped with cerium and lanthanum. The modified samples were oxidized at 1000°C for 100 h in air. The obtained effects were: oxide scales formed on the treated samples were more fine-grained, compact and adhering better that those formed on the un-treated samples.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 1; 83-86
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Novel Route to Prepare Magnetic Material $Co_3V_2O_8$ and Structural Characterization
    Autorzy:
    Celik, G.
    Kurtulus, F.
    Guler, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1491310.pdf
    Data publikacji:
    2012-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    07.85.-m
    32.30.Rj
    33.20.Ea
    61.43.Gt
    61.66.Fn
    65.40.-b
    75.47.Lx
    81.40.Gh
    82.33.Pt
    84.40.-x
    Opis:
    $Co_3V_2O_8$ is a member of kagomé staircase oxides, represented by general formula $M_3V_2O_8$ (M = Ni, Co, Mn). It attracted great attention due to strong magnetic anisotropy, magnetic phase transition, genuine macroscopic quantum effects, strong quantum fluctuations, low-temperature ferroelectricity, field-induced magnetic transitions, complicated phase diagram and displays long-range magnetic order because of geometrical frustration. Different routes to prepare the frustrated magnetic material was reported such as floating zone technique and conventional high temperature method. $Co_3V_2O_8$ (International Centre for Diffraction Data (ICDD): 16-675) was synthesized with $Co_3O_4$ (ICDD: 80-1536) as binary phase by microwave assisted preparation using $Co(NO_3)_2 ·6H_2O$ and $NH_4VO_3$. The synthesized material was characterization by powder X-ray diffraction, the Fourier transform infrared spectroscopy, and thermogravimetric-differential thermal analysis.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 1; 203-204
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Growth, Morphology and Superconductivity of Epitaxial (RE)$\text{}_{1}$Ba$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7-δ}$ Films on SrTiO$\text{}_{3}$ and NdGaO$\text{}_{3}$ Substrates
    Autorzy:
    Krumme, J.-P
    David, B.
    Doormann, V.
    Eckart, R.
    Rabe, G.
    Dössel, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1964234.pdf
    Data publikacji:
    1997-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.65.+g
    74.76.-w
    81.15.-z
    Opis:
    The growth of (RE)$\text{}_{1}$ Ba$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7-δ}$ (RE: Y, Nd) films on NdGaO$\text{}_{3}$ and SrTiO$\text{}_{3}$ substrates by ion-beam and dc-/rf-magnetron sputter deposition is discussed in the framework of growth kinetics, oxygen exchange, epitaxial relations, substrate crystal orientation, in-plane coherence, vicinal substrate cuts, overgrowth on steps, superconductor/insulator combinations, and patterning by ion-beam etching. The process conditions for ion-beam and magnetron sputter deposition are briefly outlined.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 1; 55-68
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Morphology and Selected Properties of Core/Shell ZnTe-Based Nanowire Structures Containing ZnO
    Autorzy:
    Gas, K.
    Janik, E.
    Zaleszczyk, W.
    Pasternak, I.
    Dynowska, E.
    Fronc, K.
    Kolkovsky, V.
    Kret, S.
    Morhange, J. F.
    Reszka, A.
    Wiater, M.
    Caliebe, W.
    Karczewski, G.
    Kowalski, B. J.
    Szuszkiewicz, W.
    Wojtowicz, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047950.pdf
    Data publikacji:
    2011-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.37.Hk
    68.37.Lp
    68.65.La
    81.07.Vb
    Opis:
    We report on an approach to fabricate ZnTe-based core/shell radial heterostructures containing ZnO, as well as on some of their physical properties. The molecular beam epitaxy grown ZnTe nanowires constituted the core of the investigated structures and the ZnO shells were obtained by thermal oxidation of ZnTe NWs. The influence of the parameters characterizing the oxidation process on selected properties of core/shell NWs were examined. Scanning electron microscopy revealed changes of the NWs morphology for various conditions of the oxidation process. X-ray diffraction, high resolution transmission electron microscopy, and Raman scattering measurements were applied to reveal the presence of ZnTe single crystal core and polycrystalline ZnO-shell of investigated structure.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 5; 612-614
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-57 z 57

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