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Wyświetlanie 1-15 z 20
Tytuł:
Raman Studies of ZnO Products Synthesized by Solution Based Methods
Autorzy:
Gültekin, D.
Akbulut, H.
Powiązania:
https://bibliotekanauki.pl/articles/1398789.pdf
Data publikacji:
2016-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.30.Fs
81.07.Bc
81.07.-b
81.20.Fw
Opis:
In this study, nanostructured ZnO thin film coatings produced by sol-gel method have been examined and characterized. ZnO thin film coatings synthesized by the preparation of ZnO sols in the liquid phase from homogeneous solutions with precursor of zinc acetate dihydrate (Zn(CH₃COO)₂·2H₂O). Ethanol (C₂H₅OH) has been used as a solvent material and monoethanolamine (MEA) has been used as a complexing agent. The final solutions have 0.1, 0.3, 0.5, 0.7 and 1 molar concentrations. General morphologies and detailed structural characterizations have been obtained by using scanning electron microscope (SEM). Qualitative analyses of the synthesized coatings were performed using X-ray diffraction (XRD) and Raman spectroscopy. The Raman spectroscopy studies of precursor, solution and final products were carried out to investigate transformation of the chemical compounds from the initial material to the final coating.
Źródło:
Acta Physica Polonica A; 2016, 129, 4; 803-805
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Topographic Peculiarities of the Formation of Nanosized Particles from Metallopolymers
Autorzy:
Pomogailo, A. D.
Dzhardimalieva, G. I.
Rosenberg, A. S.
Powiązania:
https://bibliotekanauki.pl/articles/2035462.pdf
Data publikacji:
2002-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.07.-b
81.07.Bc
Opis:
The morphology of solid phase products of thermal transformation of transition metal acrylates or its cocrystallites is studied. The thermal transformation of the metal-containing monomers studied consists in dehydration, solid phase polymerization and thermolysis process. The topography of the initial compounds and solid phase products of thermal decay, as well as their composition, are analyzed by optical and electron microscopies. The average particle sizes, d$\text{}_{EM}$, are: 6.0-13.0 nm in the case of FeAcr$\text{}_{6}$ (based on the data of electron diffraction, the main product is Fe$\text{}_{3}$O$\text{}_{4}$), 6.0 nm for FeCoAcr$\text{}_{8}$ and Fe$\text{}_{2}$CoAcr$\text{}_{14}$ (Fe$\text{}_{3}$O$\text{}_{4}$, CoO, Fe$\text{}_{2}$CoO$\text{}_{4}$), and 6 nm for CoMal$\text{}_{2}$ (CoO). The material formed consists of nanosized metal particles uniformly allotted in polymer matrix.
Źródło:
Acta Physica Polonica A; 2002, 102, 1; 135-145
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Comparative Study of the Microstructure and Phase Composition of Nanoausferritic Ductile Iron Alloy Using SEM, TEM, Magnetometer, and X-Ray Diffraction Methods
Autorzy:
Skołek, E.
Giętka, T.
Świątnicki, W.
Myszka, D.
Powiązania:
https://bibliotekanauki.pl/articles/1033075.pdf
Data publikacji:
2017-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.05.-a
06.60.Mr
81.05.Bx
81.07.Bc
81.40.-z
81.40.Ef
81.40.Gh
Opis:
In this paper the microstructure and phase composition of ausferritic ductile iron alloy were investigated by scanning electron microscopy, transmission electron microscopy and X-ray diffraction methods. In order to obtain the nanoausferritic microstructure in the alloy, the austempering heat treatment was performed at relatively low temperature. As a result, a specific kind of microstructure, containing nanocrystalline ausferrite and retained austenite blocks, was obtained in each heat-treated sample. The volume fractions of phases were determined using different methods: MicroMeter software for scanning electron micrographs, stereological analysis for transmission electron micrographs, quantitative analysis of the X-ray diffraction spectra and magnetometer measurements. All methods revealed a high amount of retained austenite which varied as a function of the austempering treatment parameters. It was shown that the quantitative phase composition measured by X-ray diffraction and magnetometer, in all samples investigated, differs significantly from the stereological measurements and image analysis performed through the MicroMeter software. The possible reasons of the observed differences were discussed.
Źródło:
Acta Physica Polonica A; 2017, 131, 5; 1319-1323
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Environment-Friendly Magnetic Fluids for Wastewater Remediation - Synthesis and Characterization
Autorzy:
Nadejde, C.
Neamtu, M.
Creanga, D.
Powiązania:
https://bibliotekanauki.pl/articles/1388053.pdf
Data publikacji:
2015-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.16.Be
81.07.Bc
68.43.-h
75.50.Mm
89.60.Ec
Opis:
Magnetic nanostructured materials have been found to be very efficient in wastewater decontamination. Among the various synthesis methods, co-precipitation is a rapid and cost-effective technique for the manufacturing of magnetic nanoparticles; moreover, using green chemistry for their stabilization with natural non-toxic capping agents in aqueous solution, such materials become potential candidates as nanocatalytic formulations for water remediation, topic which represents the aim of the present study. Thus, three types of environment-friendly magnetic fluids were synthesized using the chemical precipitation route, the resulted samples being further characterized by various analytical techniques, in order to assess their microstructural features. The results revealed excellent stability in suspension of all samples, the magnetite nanoparticles exhibiting sizes in the nanoscale range with a relatively spherical shape and suitable magnetic properties. Such nanoparticle based products could be the right choice for magnetic responsive and recyclable materials used in the degradation of emerging pollutants from wastewaters.
Źródło:
Acta Physica Polonica A; 2015, 127, 2; 647-649
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preparation of Iron Nanoparticles by Selective Leaching Method
Autorzy:
Michalcová, A.
Vojtěch, D.
Kubatík, T.
Stehlíková, K.
Brabec, F.
Marek, I.
Powiązania:
https://bibliotekanauki.pl/articles/1402107.pdf
Data publikacji:
2015-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.05.J-
61.05.cp
75.50.Bb
81.40.-z
81.07.Bc
Opis:
Iron nanoparticles were prepared by selective leaching method. Initially the rapidly solidified AlFe11 alloy was prepared and consequently the aluminium matrix was dissolved from this alloy in 20% NaOH solution. This process was carried out at 0 and 80°C. At lower temperature, the iron nanoparticles covered by thin layer of Fe(OH)₃ were successfully obtained. The size of formed nanoparticles was about 8 nm and the particles exhibited massive agglomeration. It is not limitation of the process, because the application of nanoparticles is as a precursor for production of bulk nanocrystalline materials (metals, alloys and metal matrix composites). At higher temperature, the selective leaching process failed and iron was oxidized to different hydroxides. Aluminium containing waste liquid from selective leaching was used for production of powder Al₂O₃. Initial alloys and products were characterized by X-ray diffraction, scanning electron microscopy, and high resolution transmission electron microscopy.
Źródło:
Acta Physica Polonica A; 2015, 128, 4; 640-642
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural Characterization of $La_{1-x}Sr_xCoO_3$ Thin Films Deposited by Pulsed Electron Deposition Method
Autorzy:
Cieniek, Ł.
Kopia, A.
Cyza, A.
Kowalski, K.
Kusiński, J.
Powiązania:
https://bibliotekanauki.pl/articles/1398370.pdf
Data publikacji:
2016-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.15.-z
81.10.Bk
81.07.Bc
68.55.-a
68.55.J-
68.55.Nq
68.37.-d
Opis:
The aim of the presented research was to investigate the influence of strontium dopant on the structure and composition of $La_{1-x}Sr_{x}CoO_3$ (x=0, 0.1, 0.2) perovskite thin films. Pure and Sr doped LaCoO₃ thin films were grown by pulsed electron deposition technique on crystalline epi-polished Si/MgO substrates. Numerous analytical techniques (scanning electron microscopy, atomic force microscopy, X-ray photoelectron spectroscopy, and X-ray diffraction) were applied to characterize their phase/chemical composition, structure and surface morphology. X-ray diffraction analysis showed the presence of pure LaCoO₃ perovskite phase in the undoped thin film. For Sr doped thin films $La_{0.8}Sr_{0.2}CoO_3$ (x=0.2), $La_{0.9}Sr_{0.1}CoO_3$ (x=0.1) small contents of La₂ O₃ and LaSrCoO₄ phases were noticed. The crystallite sizes, calculated from the Williamson-Hall plots, were about 18 nm for all analyzed films. According to scanning electron microscopy/atomic force microscopy observations, obtained thin films were free from defects and cracks. Atomic force microscopy (tapping mode) analysis revealed the differences in the shape and quantity of surface crystallites for all thin films as a result of Sr doping and different deposition parameters. Atomic force microscopy technique also allowed measurement of roughness parameters for analyzed samples. X-ray photoelectron spectroscopy analyses of chemical states of elements of thin films showed that their chemical state was stable across the film thickness and even at the interface with the MgO substrate. X-ray photoelectron spectroscopy analysis also allowed to evaluate chemical states and atomic concentration of La, Co, and Sr elements within cross-sections of deposited thin films.
Źródło:
Acta Physica Polonica A; 2016, 130, 4; 1121-1123
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure and Magnetic Properties of Nanocrystalline Fe-Mo Alloys Prepared by Mechanosynthesis
Autorzy:
Karolus, M.
Jartych, E.
Oleszak, D.
Powiązania:
https://bibliotekanauki.pl/articles/2035497.pdf
Data publikacji:
2002-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.10.Eq
07.85.Jy
81.07.Bc
81.07.Wx
61.18.Fs
87.64.Pj
Opis:
Nanocrystalline samples of Fe$\text{}_{80}$Mo$\text{}_{20}$ and Fe$\text{}_{50}$Mo$\text{}_{50}$ alloys were prepared by the mechanical milling method. The structure, lattice parameters, and crystallite size were determined by the X-ray diffraction. The magnetic properties of the milled products were determined by the M"ossbauer spectroscopy. It was observed that in the case of the Fe$\text{}_{80}$Mo$\text{}_{20}$ alloy a solid solution of Mo in Fe was formed with the lattice parameters of Fe increasing from 0.28659 nm to 0.29240 nm and the crystallite size decreasing from 250 nm to 20 nm. In the case of the Fe$\text{}_{50}$Mo$\text{}_{50}$ alloy there were no clear changes in values of the lattice parameters of Fe and Mo during the milling process, but the crystallite size decreased from 200 nm to 15 nm. Mössbauer spectra revealed different magnetic phases in the mechanosynthesized Fe-Mo samples. In the case of the Fe$\text{}_{80}$Mo$\text{}_{20}$ alloy, the spectrum for the milled mixture indicated the formation of a solid solution. In contrast, for the Fe$\text{}_{50}$Mo$\text{}_{50}$ the spectrum indicated the disappearance of the ferromagnetic phase.
Źródło:
Acta Physica Polonica A; 2002, 102, 2; 253-258
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nanoscale Analysis of Superparamagnetic Systems
Autorzy:
Chrobak, A.
Ziółkowski, G.
Powiązania:
https://bibliotekanauki.pl/articles/1033082.pdf
Data publikacji:
2017-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.07.Bc
75.50.Tt
75.60.-d
76.80.+y
Opis:
The paper refers to a kind of nanoscale characterization of superparamagnetic materials above and below the so-called blocking temperature. It is propose to apply the Stoner-Wohlfarth model of nanoparticles magnetization supplemented by the two-level kinetic model, determining behavior in T>0. This approach allows determination of distribution of magnetic moments and energetic barriers of magnetic objects based on magnetization curves. In many cases, the determined distribution of magnetic moments can be recalculated into average size of the magnetic objects giving finally a nano/microscaled picture of the material. The proposed method was successfully used in characterization of diluted magnetics, nanocomposites, powders and even for human hemoglobin. In the paper the basic theory and its application to the nanoscale characterization is discussed in detail.
Źródło:
Acta Physica Polonica A; 2017, 131, 5; 1371-1374
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic hardening induced in RCo₅ (R = Y, Gd, Sm) by short HEBM
Autorzy:
Łopadczak, P.
Bajorek, A.
Prusik, K.
Zubko, M.
Chełkowska, G.
Powiązania:
https://bibliotekanauki.pl/articles/1048324.pdf
Data publikacji:
2018-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.07.-b
81.07.Bc
75.50.Ww
75.60.-d
75.75.Cd
Opis:
The paper is focused on the magnetic and structural properties of RCo₅ (R = Y, Gd, Sm) intermetallics fabricated by high energy ball - milling (HEBM). The investigated samples were first produced by arc-melting as bulk materials and then were milled for 1h in dimethylformamide with balls to powder ratio 10:1. The influence of the HEBM parameters on the microstructure was investigated by a variety of complementary measurement methods. The Rietveld refinement was performed to estimate the dependence of crystallite size and microstrain on type of sample. The hysteresis loops were recorded by SQUID magnetometer at 2 K and 300 K and at magnetic field up to μ₀H=7 T. The impact of short HEBM process is visible as the enhancement of coercivity and simultaneous reduction of the saturation magnetization.
Źródło:
Acta Physica Polonica A; 2018, 133, 3; 688-690
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure and Magnetic Properties of Nanocrystalline $NiFe_{2}O_{4}$ Prepared via Precipitation Route
Autorzy:
Žák, T.
David, B.
Ćosović, A.
Ćosović, V.
Živković, D.
Talijan, N.
Powiązania:
https://bibliotekanauki.pl/articles/1378217.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.05.cp
75.50.Tt
81.07.Bc
81.07.Wx
Opis:
Nanocrystalline Ni-ferrite was synthesized by modified precipitation method in which soluble starch is used as dispersing agent and $Na_{2}CO_{3}$ as a precipitating agent. $NiSO_{4}·6H_{2}O$ and $Fe(NO_{3})_{3}·9H_{2}O$ were used as precursors for nickel and ferric oxide, respectively. The obtained nanocrystalline Ni-ferrite was analysed and discussed through structural, compositional and magnetic characterization. Formation of pure $NiFe_{2}O_{4}$ phase with average crystallite size of 21 nm has been confirmed by X-ray diffraction analysis (XRD). The determined phase composition was additionally supported by results of $\text{}^{57}Fe$ Mössbauer phase (MS) analysis and material's nanocrystalline structure by field emission scanning electron microscopy (FE-SEM). Thermomagnetic behaviour was studied up to 800 °C. The obtained room temperature magnetic hysteresis loop, recorded by means of a vibrating sample magnetometer (VSM), exhibits characteristic "S" shape of the soft magnetic material with the measured coercivity of about 10 kA/m and the specific moment up to 40 $Am^{2}$/kg.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 142-143
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetization Processes of Nanoparticles Embedded into Ferromagnetic Matrix
Autorzy:
Ziółkowski, G.
Chrobak, A.
Powiązania:
https://bibliotekanauki.pl/articles/1387548.pdf
Data publikacji:
2015-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.07.Bc
75.50.Tt
75.60.-d
75.78.Cd
Opis:
The paper refers to computer simulations of interactions between magnetically hard particle embedded into ultra-hard matrix. We used simulated annealing and Monte Carlo simulations in a frame of the 3D Heisenberg model. The performed simulations reveal that the particles show additional exchange anisotropy dependent on "frozen" spin direction in the matrix and the angle between matrix and particle easy magnetization axes. The particle-matrix coupling are responsible for multi-phase magnetic hysteresis shape and exchange-bias like effect.
Źródło:
Acta Physica Polonica A; 2015, 127, 2; 597-599
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Physical Properties of ZnCoO Tetrapods and Nanofibers
Autorzy:
Gas, K.
Fronc, K.
Dziawa, P.
Knoff, W.
Wojciechowski, T.
Zaleszczyk, W.
Baranowska-Korczyc, A.
Morhange, J.
Paszkowicz, W.
Elbaum, D.
Karczewski, G.
Wojtowicz, T.
Szuszkiewicz, W.
Powiązania:
https://bibliotekanauki.pl/articles/1791329.pdf
Data publikacji:
2009-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.Et
78.67.Bf
81.05.Dz
81.07.Bc
Opis:
In this paper the physical properties of two types of Co-doped ZnO nanostructures: tetrapods and nanofibers grown by a rapid thermal evaporation process and prepared by the electrospinning technique, respectively, were investigated and analyzed. Surface morphology of the samples was examined using scanning electron microscopy. X-ray diffraction measurements showed hexagonal wurtzite crystal structure of both types of investigated nanostructures. Both X-ray diffraction and Raman scattering data confirmed high phase purity of the samples. The magnetic properties studied with the use of the SQUID magnetometer confirmed a presence of ferromagnetic order in analyzed nanostructures. The observed photoluminescence spectra exhibited two groups of lines. The first one, in the ultraviolet spectral range, is due to the optical transitions close to ZnO band gap, the second one in the red region is most probably related to the $Co^{2+}$ d-d internal transitions. The influence of native defects on the optical properties is also shown and discussed. All results reported here lead us to the conclusion that in the mixed crystal nanostructures obtained, a fraction of the $Zn^{2+}$ ions is substituted by $Co^{2+}$ ions.
Źródło:
Acta Physica Polonica A; 2009, 116, 5; 868-870
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and Optical Properties of Co and Zn-Based Metal Oxide Nanoparticle Thin Films
Autorzy:
Gungor, E.
Gungor, T.
Caliskan, D.
Ozbay, E.
Powiązania:
https://bibliotekanauki.pl/articles/1032063.pdf
Data publikacji:
2017-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.07.Bc
78.67.Bf
Opis:
ZnO, Co doped ZnO (ZnO:Co) and CoO thin films were deposited on glass substrates by using the spark discharge technique with Zn-Zn, Zn-Co and Co-Co metal electrodes (tips). The structural and optical properties of the films were characterized by X-ray diffraction, scanning electron microscopy measurements and UV-Vis spectrometry. Cubic phase reflection of CoO (200) was observed in the samples containing Co. The size of nanoparticles had varied between 38 nm and 200 nm in ZnO thin films. When Co electrode was used, spherical structure had deteriorated and clusters of particles, with smaller radii, were observed. In addition, when Co-Co electrode pairs were used, various cavities with different sizes were formed. Especially, it was observed that the optical transmittance had generally increased with the decreasing spark (charge) voltage, while increasing with the number of sparks. The Co-containing samples were green in color and it was observed that the loss of transmission appears in a specific region in the Co-doped ZnO thin films due to characteristic d-d transition of Co²⁺ ions. The thickness of the films had decreased with the increasing number of sparks. In addition, the band gap energy, E_{g}, evaluated by UV-Vis spectroscopy measurements has been shifted to higher wavelengths (red shift) for the ZnO:Co thin films.
Źródło:
Acta Physica Polonica A; 2017, 131, 3; 500-503
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Size Effect of Hard Magnetic Properties of Fe-Nb-B-Tb Milled Alloys
Autorzy:
Granek, K.
Ziółkowski, G.
Chrobak, A.
Klimontko, J.
Talik, E.
Powiązania:
https://bibliotekanauki.pl/articles/1030390.pdf
Data publikacji:
2018-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.07.Bc
75.50.Tt
75.60.d
76.80.+y
Opis:
The paper refers to magnetic and structural properties of powders made of Fe-Nb-B-Tb ultra-high coercive alloy. The initial alloy was milled in a low energy mill for 1 h and 14 h. With increasing milling time we observed gradual deterioration of hard magnetic properties i.e. the coercive field decreases from 5.51 T to 0.14 T for the bulk alloy and 14 h milled powder, respectively. However, for the 1 h milling time the micrometric powder reveals quite high coercivity of 2.77 T which is promising for possible applications in magnetic composites.
Źródło:
Acta Physica Polonica A; 2018, 133, 3; 645-647
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of synthesis parameters of graphene/Fe₂O₃ nanocomposites on their structural and electrical conductivity properties
Autorzy:
Jędrzejewska, A.
Sibera, D.
Narkiewicz, U.
Pełech, R.
Jędrzejewski, R.
Powiązania:
https://bibliotekanauki.pl/articles/1055069.pdf
Data publikacji:
2017-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.48.Gh
65.80.Ck
81.07.Bc
Opis:
Due to its fascinating properties such as high surface area, very good electrical and thermal conductivity, excellent mechanical properties, optical and electrochemical properties, graphene may be the ideal material as a substrate of nanocomposites for applications in electronics. Graphene layer can be used as a conductive matrix allowing good contact between crystallites of nanomaterials. Despite pure graphene, its composites with other species can be of interest. In this paper the results of studies on the effect of methods and parameters of synthesis, for obtaining composites graphene/Fe₂O₃ on their structural properties and electrical properties are presented. A series of experiments was conducted using a commercially available graphene (Graphene Nanopowder AO-3) and iron nitrate. The materials were obtained using two pressure methods: pressure synthesis in the autoclave and synthesis in the microwave solvothermal reactor. The syntheses were carried out in a solution of ethanol. The specific surface area, helium density, morphology, phase composition, thermal properties and electric conductivity of the obtained composites were investigated.
Źródło:
Acta Physica Polonica A; 2017, 132, 4; 1424-1429
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
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