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Wyszukujesz frazę "81.40.Rs" wg kryterium: Temat


Wyświetlanie 1-40 z 40
Tytuł:
Thermomagnetic Behaviour and Microstructure of a Rapidly Quenched $Nd_{4.5}Fe_{77}B_{18.5}$ Alloy
Autorzy:
Talijan, N.
Ćosović, V.
Grujić, A.
Stajić-Trošić, J.
Žák, T.
Powiązania:
https://bibliotekanauki.pl/articles/1813871.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.40.Rs
Opis:
Changes in the phase composition and crystallite size, as well as changes in the magnetic behaviour of $Nd_{4.5}Fe_{77}B_{18.5}$ alloy, caused by thermomagnetic measurements, was observed in regard of the optimal magnetic state of this alloy. In the optimized magnetic state, the formed nanocomposite consisted of $Fe_3B//Nd_2Fe_{14}B$ and partly of α-Fe with a mean crystallite size < 30 nm, as determined by X-ray diffraction and transmission electron microscopy. An increased amount of α-Fe, the presence of $Nd_2O_3$ and different Fe-B phases, as well as an increase in the mean crystallite size were observed after thermomagnetic measurements had caused a quality loss of the hard magnetic properties.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 525-528
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Post Growth Annealing on the Structural and Electrical Properties of ZnO/CuO Composite Nanostructures
Autorzy:
Hussain, Mushtaque
Khan, Azam
Nur, Omer
Willander, Magnus
Powiązania:
https://bibliotekanauki.pl/articles/1205261.pdf
Data publikacji:
2014-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.40.Rs
81.40.-z
Opis:
In the present work, ZnO/CuO composite nanostructures have been grown on fluorine doped tin oxide coated glass substrate by aqueous chemical growth method. To observe the effect of post growth annealing (500°C, 1 min) on the structural properties of ZnO nanorods scanning electron microscope and X-ray diffraction techniques have been utilized. SEM images of post growth annealed (post growth annealed) sample reveal that the average diameter of ZnO NRs has considerably increased in comparison with as grown sample. Moreover after post growth annealing the ZnO NRs showed more clearly hexagonal wurtzite structure. Beside this the NRs are also uniform and well aligned with a high aspect ratio of $~10$. In XRD pattern the strongly intense (002) peak of the post growth annealing sample suggest that the crystal quality of the NRs have also been improved significantly. Since the structural improvement have a significant impact on charge transport properties as well, therefore the effect of post growth annealed has also been investigated by the electrical characterization of ZnO/CuO based heterojunction. The current-voltage measurements of the post growth annealed sample showed improvement in the current in comparison with as grown sample. The impedance study has also confirmed that the post growth annealed has influence on the electrical properties. The presented post growth annealed heterojunction of ZnO/CuO may have space in applications like sensors and oxide based diodes in the devices fabrication.
Źródło:
Acta Physica Polonica A; 2014, 126, 3; 849-854
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of High Power Laser Beam on Physical Properties of Epitaxial Films of Hg$\text{}_{1-x}$Cd$\text{}_{x}$Te (x≈0.2)
Autorzy:
Kuźma, M.
Abeynayake, C.
Sheregii, E.
Virt, I.
Powiązania:
https://bibliotekanauki.pl/articles/1891472.pdf
Data publikacji:
1991-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.60.Cs
81.40.Rs
Opis:
Models have been proposed explaining differences in electrophysical and photoelectrical properties of epitaxial films of Hg$\text{}_{1-x}$Cd$\text{}_{x}$Te (x≈0.2) before and after treating by single pulses of Nd:YAG laser. These models were obtained on the basis of the calculated distributions of temperature, temperature gradient and concentration of interstitial mercury during and after exposing to the laser pulse. These calculations were done using the net method.
Źródło:
Acta Physica Polonica A; 1991, 80, 3; 475-479
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of two-stage magnetic Barkhausen noise measurement method at power line frequency
Autorzy:
Pal'a, J.
Šoka, M.
Powiązania:
https://bibliotekanauki.pl/articles/1070541.pdf
Data publikacji:
2016-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.40.Rs
75.60.Ej
Opis:
The aim of the paper was to study the features of measurement of the magnetic Barkhausen noise by the new two-stage method in the high excitation frequency region (power line frequency). The magnetic Barkhausen noise was investigated on grain oriented Fe-3%Si steel subjected to different heat treatment. By application of an air coil on the output of the power amplifier we were able to linearize the excitation field. At the same time, the air coil suppressed the unwanted noise from the output of the power amplifier. We have found that the two-stage method is able to reveal a peak of the power spectrum even if it is located at low frequency, in contrast to the classical one-stage method. Further, we successfully applied a model of the power spectrum to the real magnetic Barkhausen noise obtained from the two-stage measurement.
Źródło:
Acta Physica Polonica A; 2016, 129, 3; 383-387
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adaptive Testing of Ferromagnetic Materials Utilizing Barkhausen Noise
Autorzy:
Pal'a, J.
Bydžovský, J.
Powiązania:
https://bibliotekanauki.pl/articles/1205257.pdf
Data publikacji:
2014-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.40.Rs
75.60.Ej
Opis:
A new method of the Barkhausen noise measurement and optimization of the measured data processing with respect to non-destructive evaluation of ferromagnetic materials is proposed. The measuring method is based on well-known method of magnetic adaptive testing where a complex set of minor hysteresis loops is measured. Collecting the sets of obtained Barkhausen noise envelopes into suitable designed matrices and optimizing the data processing with respect to the maximum sensitivity to the evaluated variable were developed. The method is illustrated on the evaluation of plastic deformation of a steel sample. It is shown that the proposed measuring method and measured data processing bring an improvement of the sensitivity to the evaluated variable when comparing with measuring the traditional Barkhausen noise parameter (root mean square).
Źródło:
Acta Physica Polonica A; 2014, 126, 3; 855-859
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dependence of Barkhausen Noise in Plastically Deformed Steel on Frequency and Nonlinearity of Magnetizing Field
Autorzy:
Pala, J.
Bydžovský, J.
Powiązania:
https://bibliotekanauki.pl/articles/1813511.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.40.Rs
75.60.Ej
Opis:
The Barkhausen noise was measured in plastically deformed low-carbon steel at various frequencies of the magnetizing field. Strip samples magnetized by a yoke were used for investigation. The measured amplitude distributions and power spectra are compared with the results of the Alessandro, Beatrice, Bertotti, Montorsi model of the Barkhausen noise. The measurement results at the triangular magnetizing current and the triangular magnetic field in the sample were compared and the differences will be discussed.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 23-26
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effects of Chemical Composition on Soft Magnetic Materials Behaviour
Autorzy:
Bidulský, R.
Actis Grande, M.
Ferraris, L.
Ferraris, P.
Bidulská, J.
Powiązania:
https://bibliotekanauki.pl/articles/1533981.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.-y
81.20.Ev
81.40.Rs
Opis:
The main aim of the presented work was to study the effects of chemical composition on the magnetic properties (in terms of B-H characteristics) of an insulated iron powder compound with various addition of the aluminium alloy (0, 5 and 10 wt%). The magnetic properties of the powder were significantly influenced by density and "sintering" effects. The addition of aluminium alloy maintaining suitable values of coercive force, remanence and core losses; this makes the modified insulated iron powder compound a promising soft magnetic material in several applications.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 802-803
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preparation of nanocomposite magnetic compounds based on layered semiconductors by means of electrochemical intercalation in a gradient magnetic field
Autorzy:
Boledzyuk, V.
Bakhtinov, A.
Kovalyuk, Z.
Kudrynskyi, Z.
Ivanov, V.
Slyn'ko, V.
Powiązania:
https://bibliotekanauki.pl/articles/1159217.pdf
Data publikacji:
2016-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Tx
81.05.Hd
81.40.Rs
Opis:
In this paper we propose a method of intercalation of layered single crystals with atoms of 3d-metals in a magnetic-field gradient. We report on structure properties of Co_{x}InSe and Co_{x}In₂Se₃ layered crystals intercalated by cobalt. It was established that ferromagnetic ordering at room temperature is observed in the intercalated crystals. The crystals are a nanocomposite material that consists of a layered matrix and arrays of Co nanoformations on the van der Waals surfaces of InSe and In₂Se₃ layers.
Źródło:
Acta Physica Polonica A; 2016, 130, 3; 773-777
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetism in Carbon: Writing Magnetic Structures with a Proton Micro-Beam on Graphite Surfaces
Autorzy:
Schindler, K.
Spemann, D.
Ziese, M.
Esquinazi, P.
Butz, T.
Powiązania:
https://bibliotekanauki.pl/articles/2044648.pdf
Data publikacji:
2006-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.40.Rs
75.50.Pp
81.05.Uw
Opis:
Recent publications demonstrated the generation of magnetic order at room temperature on graphite surfaces after irradiation with protons. In this contribution we show that it is possible to produce magnetic structures in the micrometer range using a proton micro-beam by proton irradiation of the surface of highly oriented pyrolytic graphite samples. The experimental results are compared with micromagnetic simulations.
Źródło:
Acta Physica Polonica A; 2006, 109, 3; 249-255
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of Cryo-Rolling and Annealing on Magnetic Properties in Non-Oriented Electrical Steel
Autorzy:
Kvačkaj, T.
Bella, P.
Bidulský, R.
Kočiško, R.
Petroušek, P.
Fedoriková, A.
Bidulská, J.
Jandačka, P.
Lupták, M.
Černík, M.
Pernis, R.
Powiązania:
https://bibliotekanauki.pl/articles/1032280.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Bb
81.05.Bx
81.40.Rs
81.40.Ef
Opis:
The goal of the present work is to compare progressive technology - rolling at cryogenic temperature and classical rolling at ambient temperature followed by an investigation of their impact on the final microstructure and the magnetic properties of non-oriented electrical steel. Non-oriented electrical steel is characterized by high magnetic induction, low magnetic losses, and low coercivity. The best magnetic properties are achieved using preferable texture and optimal grain size. In this paper there is analyzed the percentage of different textural components after cryo-rolling and after rolling at ambient temperature. To obtain maps of inverse pole figures, the electron backscatter diffraction method was used. The main contribution of this study was that the samples rolled at cryo conditions and after final annealing reached better magnetic properties than at ambient temperature, which was reflected by low magnetic losses and coercivity.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 1105-1107
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Annealing Conditions on Structural Development of Cryo Rolled FeSi Steel
Autorzy:
Kvackaj, T.
Bidulska, J.
Bidulsky, R.
Kovacova, A.
Kocisko, R.
Bella, P.
Luptak, M.
Bacso, J.
Powiązania:
https://bibliotekanauki.pl/articles/1367991.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Bb
81.05.Bx
81.40.Rs
81.40.Ef
Opis:
Non grain oriented isotropic electrical steels, commercially called NGOES, were investigated in cryogenic temperature conditions. At cryogenic temperatures plastic deformations form strong structural heterogeneities in the sample thickness. Samples processed by cryo rolling show a bigger storage energy. To achieve abnormal grain growth through the process of static recrystallization, the annealing conditions were applied to the deformed samples. Moreover, minimal magnetic losses were reached when mean grain size diameter was approximately 150 μm.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 184-185
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Transport and Magnetic Properties of Low Temperature Annealed Ga$\text{}_{1-x}$Mn$\text{}_{x}$As
Autorzy:
Kuryliszyn, I.
Wojtowicz, T.
Liu, X.
Furdyna, J. K.
Dobrowolski, W.
Broto, J.-M.
Goiran, M.
Portugall, O.
Rakoto, H.
Raquet, B.
Powiązania:
https://bibliotekanauki.pl/articles/2035604.pdf
Data publikacji:
2002
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Pp
75.50.Dd
81.40.Rs
Opis:
We present the results of low temperature annealing studies of Ga$\text{}_{1-x}$Mn$\text{}_{x}$As epilayers grown by low temperature molecular beam epitaxy in a wide range of Mn concentrations (0.01
Źródło:
Acta Physica Polonica A; 2002, 102, 4-5; 659-665
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Composition and Temperature Dependence of Giant Magnetoresistance in Melt-Spun Co_{x}Cu_{100-x} Ribbons
Autorzy:
Idzikowski, B.
Nenkov, K.
Handstein, A.
Hütten, A.
Müller, K. H.
Powiązania:
https://bibliotekanauki.pl/articles/1964599.pdf
Data publikacji:
1997-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.70.Pa
72.15.Eb
81.40.Rs
Opis:
Structure, magnetic properties and magnetoresistance in as-quenched and annealed Co$\text{}_{x}$Cu$\text{}_{100-x}$ samples were investigated. Homogeneous metastable Co$\text{}_{x}$Cu$\text{}_{100-x}$ alloys were prepared by the single-roller technique. The maximum value of magnetoresistance is shifted to higher annealing temperatures with increasing measuring temperature. At higher measuring temperatures the magnetoresistance is not saturated in fields as high as 16 T. Susceptibility measurements showed the formation of hcp-structured Co clusters. For small cobalt concentrations there is a transition from giant magnetoresistance to the normal anisotropic magnetoresistance.
Źródło:
Acta Physica Polonica A; 1997, 92, 2; 307-310
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Molecular Orientation on Photovoltaic Efficiency and Carrier Transport in a New Semiconducting Polymer
Autorzy:
Kažukauskas, V.
Pranaitis, M.
Sentein, C.
Rocha, L.
Raimond, P.
Duyssens, I.
Van Severen, I.
Lutsen, L.
Cleij, T.
Vanderzande, D.
Powiązania:
https://bibliotekanauki.pl/articles/1813394.pdf
Data publikacji:
2008-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.50.-h
81.40.Rs
81.40.Tv
73.61.Ph
Opis:
New functionalized soluble poly(p-phenylene vinylene) derivative bearing polar molecules was designed and synthesized in order to investigate effects of molecular orientation in polymer photovoltaic devices. The active polar molecule is the 4-(N-butyl-N-2-hydroxyethyl)-1- nitro-benzene group. The grafting of the push-pull molecule with a donor/transmitter/acceptor structure, possessing a large ground state dipole moment, enables the molecular orientation by a dc electric field. An internal electric field stored in such system facilitates exciton dissociation and improves charge transport in single-layer devices. In our systems an increase in the external quantum efficiency by a factor of about 1.5 to 2 is estimated. The associated effects of orientation on the carrier injection and transport properties were evidenced.
Źródło:
Acta Physica Polonica A; 2008, 113, 3; 1009-1012
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of the Structural and Magnetic Properties of the Cobalt-Nickel Alloys Fabricated in Various Electrolyte Solutions
Autorzy:
Özdemir, R.
Korkmaz, C.
Karahan, İ.
Powiązania:
https://bibliotekanauki.pl/articles/1031413.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.Bx
81.40.Rs
81.15.Pq
82.45.Qr
Opis:
Cobalt-Nickel alloys have been widely used for decoration, in magnetic recording devices and corrosion resistance applications, etc. In this study, the influences of cobalt amount in electrolyte on the magnetic and structural properties of the electrodeposited Co-Ni alloys were investigated. An electrolyte solution, consisting of cobalt sulfate, nickel sulfate, nickel chloride and boric acid, was used in electrodeposition. The electrochemical investigation of Co-Ni alloys was completed using cyclic voltammetry and galvanostatic studies. The morphological and structural analyses of the alloys were performed using inductively coupled plasma, scanning electron microscopy, X-ray diffraction and vibrating sample magnetometer techniques. The effect of cobalt concentration on the magnetic properties, phase structure and grain size of the alloys was investigated. Magnetic hysteresis results indicate that the amount of the cobalt content in the electrolyte has a strong influence on the ferromagnetic behavior of fabricated alloys. Results of the study show that changing the electrodeposition parameters, such as composition of electrolyte solution, allows to fabricate alloys with different properties.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 1045-1049
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigations and Applications of Nanoperm-Type Soft Magnetic Materials
Autorzy:
Hasiak, M.
Łukiewski, M.
Miglierini, M.
Kaleta, J.
Powiązania:
https://bibliotekanauki.pl/articles/1534084.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.Kf
81.07.Bc
81.40.Rs
85.70.Ay
Opis:
The microstructure and magnetic properties of $Fe_{82}Zr_4Nb_3B_{10}Cu_1,$ $Fe_{80}Zr_4Mn_3B_{12}Cu_1$ and $Fe_{80}Zr_4Ti_3Cu_1B_{12}$ alloys were investigated. Using RALE software the basic parameters of transformers made from nanocrystalline alloys with about 25% and 50% of crystalline phase were calculated. The transformer made from $Fe_{80}Zr_4Ti_3Cu_1B_{12}$ alloys after annealing at 773 K for 1-shows the lowest core losses and highest efficiency.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 829-831
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of the Applied Current Density on the Structural and Magnetic Properties of the Electrodeposited Cobalt-Nickel Alloy Thin Films
Autorzy:
Özdemır, R.
Powiązania:
https://bibliotekanauki.pl/articles/1031697.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.Bx
81.40.Rs
82.45.Qr
81.15.Pq
Opis:
In this study, cobalt-nickel (Co-Ni) alloys were deposited electrochemically onto aluminum substrates under applied current densities of 103.8, 138.4, 173 and 207.6 A m¯². Influence of the applied current density on the structural and magnetic properties of the Co-Ni alloys was investigated. The bath for Co-Ni alloys deposition was composed of 0.08 mol l¯¹ CoSO₄·7H₂O, 0.2 mol l¯¹ NiCl₂·6H₂O, 0.1 mol l¯¹ NiSO₄·6H₂O and 0.25 mol l¯¹ H₃BO₃. The electrochemical investigation of Co-Ni alloys was completed using cyclic voltammetry and galvanostatic studies. Inductively coupled plasma analysis has shown that the amount of the cobalt in the deposited alloy has decreased from 73.61% to 67.01% with the increase of the applied current density from 103.8 to 207.6 A m¯². According to the magnetic analysis results, the values of coercivity coefficient of the deposited Co-Ni alloys range between 115 and 150 Oe, confirming ferromagnetic behavior of the alloys. Experiment results indicate that magnetic and structural properties of the Co-Ni alloy deposits are greatly influenced by the applied current density in the electrodeposition system.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 770-774
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
$Cu-Fe_3C(Cr_3C_2)$ Bulk Nanocomposites Prepared by Mechanosynthesis Followed by Magnetic Pulse Compaction
Autorzy:
Eremina, M.
Lomayeva, S.
Yelsukov, E.
Paranin, S.
Powiązania:
https://bibliotekanauki.pl/articles/1375351.pdf
Data publikacji:
2014-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.84.Lf
81.07.Bc
81.20.Wk
81.40.Rs
Opis:
The $Cu-Fe_3$ and $Cu-Cr_3C_2$ bulk nanocomposites are prepared by consolidation of the mechanically alloyed powders. The structure and properties (density, Vickers microhardness and electrical conductivity) of them have been studied. It is shown that microhardness is equal to 236 HV and 470 HV for a Cu-5 vol.% carbide phase and for a Cu-30 vol.% carbide phase, respectively. The microhardness which can be influenced by the heat treatment temperature depends on the grain size of the Cu matrix. The electrical conductivity values of 38-44% IACS (International Annealing Copper Standard) at room temperature have been found.
Źródło:
Acta Physica Polonica A; 2014, 126, 4; 947-950
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Heat Treatment on the ac Conductivity and Dielectric Properties of Ag$\text{}_{33}$Sb$\text{}_{31}$Se$\text{}_{36}$ Thin Films
Autorzy:
Abd El-Wahabb, E.
Powiązania:
https://bibliotekanauki.pl/articles/2044570.pdf
Data publikacji:
2005-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.61.-r
77.55.+f
81.40.Rs
81.40.Tv
81.40.Ef
Opis:
The effect of heat treatment on the ac conductivity and dielectric properties of the melt quenched and thermally evaporated Ag$\text{}_{33}$Sb$\text{}_{31}$Se$\text{}_{36}$ chalcogenide system are reported for the first time. The results of the alternating current conductivity σ$\text{}_{ac}$, the dielectric constantε$\text{}_{1}$, and the dielectric lossε$\text{}_{2}$ of the Ag$\text{}_{33}$Sb$\text{}_{31}$Se$\text{}_{36}$ thin film samples are presented over the temperature range 303-373 K and the frequency range 0.1-100 kHz. The temperature dependence of the ac conductivity σ$\text{}_{ac}$(ω) and the frequency exponent s are discussed with the aim of the correlated barrier hopping model. Values of σ$\text{}_{ac}$(ω),ε$\text{}_{1}$, and ε$\text{}_{2}$ were found to increase with the increase in the annealing temperature due to the reduction of the number of unsaturated defects which decrease the density of localized states in the band structure.
Źródło:
Acta Physica Polonica A; 2005, 108, 6; 985-996
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Room-Temperature Ferromagnetism in Zn-Mn-O, X-Ray Photoemission Surface Study
Autorzy:
Milivojević, D.
Babić-Stojić, B.
Blanuša, J.
Kovač, J.
Powiązania:
https://bibliotekanauki.pl/articles/1503685.pdf
Data publikacji:
2011-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Pp
81.40.Rs
81.70.Jb
82.80.Pv
Opis:
Room temperature ferromagnetic properties of Zn-Mn-O show evident dependence on manganese concentration and preparation conditions. We systematically studied series of samples with manganese concentration ranging from 0 to 10 at.%, prepared in air at thermal treatment temperatures ranging from 400 to 900°C. The samples were investigated by X-ray diffraction, TEM, magnetization measurements and XPS spectroscopy. XPS analyses of surface composition, chemical bonding and XPS depth profiling were successfully employed on powder revealing the chemical composition at the surface of the grains and underneath. The study emphasizes important role of the grain surface in observed room temperature ferromagnetism. It seems that the ferromagnetic phase is correlated with oxygen build up at the surface.
Źródło:
Acta Physica Polonica A; 2011, 120, 2; 311-315
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electrical, Surface Morphology and Magneto-Capacitance Properties of Pb Free Multiferroic $(BiFeO_{3})_{1-x}(BaTiO_{3})_{x}$ Solid Solutions
Autorzy:
Shariq, M.
Kaur, D.
Chandel, V.
Siddiqui, M.
Powiązania:
https://bibliotekanauki.pl/articles/1400512.pdf
Data publikacji:
2015-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.20.Ci
81.05.Je
81.40.Rs
68.37.Yz
Opis:
The solid solutions ($BiFeO_{3})_{1-x}(BaTiO_{3})_{x}$ (x=0, 0.1, 0.2, 0.3, 0.4, and 0.5) have been synthesized adopting a solid state sintering route. Well crystalline phase of ($BiFeO_{3})_{1-x}(BaTiO_{3})_{x}$ ceramics at different level of x has been optimized at sintering temperature of 950°C for 2 h. Dielectric, polarization and magnetocapacitance properties were investigated for different content level of $BaTiO_{3}$. Dielectric constant increased with increasing concentration of $BaTiO_{3}$ up to x=0.3 for all the frequencies of 10, 100, and 1000 kHz. Dielectric loss in the material is attributed to space charges, interfacial and dipolar polarizations. Measurements of P-E loop indicated evident ferroelectricity in all samples. Well formed grain with varying grain sizes and nearly uniform shape was found for ceramics samples.
Źródło:
Acta Physica Polonica A; 2015, 127, 6; 1675-1680
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Heat treatment of CuFe2 and CuCr0.6 alloys and the effect of precipitates on the grain refinement
Autorzy:
Urbańczyk-Gucwa, A.
Amrogowicz, P.
Jabłońska, M.
Rodak, K.
Powiązania:
https://bibliotekanauki.pl/articles/1075903.pdf
Data publikacji:
2016-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.40.Gh
62.20.F-
61.72.Ff
81.05.Bx
81.40.Rs
Opis:
The results of microstructure and hardness investigations of the CuFe2 and CuCr0.6 alloys after solution and ageing treatment are presented in this paper. The variants of heat treatment as: solution at 1000°C per 3 h and ageing treatment at 500°C for 2 h and at 700°C for 24 h were chosen for severe plastic deformation process realized by rolling with the cyclic movement of rolls method. The structure of CuFe2 and CuCr0.6 alloys was analysed using scanning transmission electron microscopy, and the quantitative studies of the substructure was performed with MET-ILO software, on the basis of images acquired on scanning transmission electron microscope.
Źródło:
Acta Physica Polonica A; 2016, 130, 4; 1016-1019
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Photoelectrical Behaviour of DNA:PEDT-PSS Functionalised Films
Autorzy:
Kažukauskas, V.
Pranaitis, M.
Krupka, O.
Sahraoui, B.
Powiązania:
https://bibliotekanauki.pl/articles/1505488.pdf
Data publikacji:
2011-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.50.Gr
81.40.Rs
81.40.Tv
87.85.jc
87.14.gk
Opis:
We report investigations of functionalized DNA:PEDT-PSS films. The thermal activation energy of the conductivity near the room temperature was about 0.033 eV. The weak carrier trapping was identified by the thermally stimulated current method, proving the fast recombination of light-generated carriers. A "bistable" photoconductivity below the room temperature was evidenced upon the white light excitation. By cooling the samples down to 145-155 K the photoconduction was small. Below this temperature sudden increase of the photoconductivity was observed. Meanwhile by heating the photosensitivity remained enhanced up to 235-245 K. The slow relaxations of the current after the light excitation took place, the time constant of which reached several hundreds of seconds. Such phenomenon could presumably be attributed to the light-induced changes of the sample material morphology and/or associated variation of carrier transport conditions.
Źródło:
Acta Physica Polonica A; 2011, 119, 2; 151-153
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Copper Deficiency - a Crystallochemical Nature of Ce-Doped Gd$\text{}_{2}$CuO$\text{}_{4}$ Phase. Part II
Autorzy:
Horyń, R.
Bukowska, E.
Sikora, A.
Wołcyrz, M.
Powiązania:
https://bibliotekanauki.pl/articles/2041471.pdf
Data publikacji:
2004-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
64.75.+g
81.40.Rs
75.50.-y
72.20.My
Opis:
Two samples of nominal composition Gd$\text{}_{1.80}$Ce$\text{}_{0.15}$CuO$\text{}_{4.0}$ and Gd$\text{}_{1.85}$Ce$\text{}_{0.15}$CuO$\text{}_{4.075}$ were subjected for a long-term treatment in air at 1100°C, comprised with a precise control of their weights vs. time of the treatment applied. The gravimetric analysis and the iodometric titration, both showed a deficiency on Cu-site, steadily increasing vs. time with a slight tendency to a saturation. The X-ray analysis of the resulting products showed that even after 272 h of sintering, the samples remained single phase of the "214" structure type. Refinement of their crystal structures as well as density measurements, both allowed confirming Cu deficient structure constitution of these samples. Results of dc-magnetization measurements, performed prior to reduction of the sample's overall oxygen content, did not show any sign of superconductivity down to 4.2 K. These preliminary results indicate that copper deficiency, developing during synthesis, may occur to be a decisive factor for the reported lack of superconductivity in Ce-doped Gd$\text{}_{2}$CuO$\text{}_{4}$ phase. Oxygen content reduction and further tests on the samples obtained are in progress.
Źródło:
Acta Physica Polonica A; 2004, 106, 5; 733-738
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of the Magnetic Properties of the Ni77/Fe14.4/Cu4.5/Mo0.5/Cr2.2/Si0.2 Alloy
Autorzy:
Ostrasz, Α.
Szuszkiewicz, Μ.
Kolano, R.
Powiązania:
https://bibliotekanauki.pl/articles/1933532.pdf
Data publikacji:
1995-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.80.+y
75.50.-y
81.40.Rs
78.70.Bj
Opis:
The positron annihilation and Μössbauer effect measurements in permalloy Νi77/Fe14.4/Cu4.5/Mo0.5/Cr2.2/Si0.2 for different cooling rates have been performed. The results have been discussed in view of the magnetic properties of the alloy. Based on the energy spectra of positron annihilation radiation and $\text{}^{57}$Fe Mössbauer spectra, the positron polarization coefficient and the hyperfine field distributions have been calculated, respectively. We demonstrate that the results of both, positron annihilation and Mössbauer effect measurements, are in very close relation to the initial permeability μ$\text{}_{0.4}$ (at H = 0.4 A/m) and resistivity measurements.
Źródło:
Acta Physica Polonica A; 1995, 88, 1; 211-218
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Annealing Treatment on the Structure and Magnetic Properties of Fe-Al-Cu-Nb-Si-B Alloys
Autorzy:
Pavlík, G.
Matta, P.
Sovák, P.
Zorkovská, A.
Konč, M.
Powiązania:
https://bibliotekanauki.pl/articles/2013354.pdf
Data publikacji:
2000-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.16.Bg
75.50.Kj
75.80.+q
81.40.Rs
Opis:
In this paper we present experimental results on influence of Al content on the structure and saturation magnetostriction of Fe-Al-Cu-Nb-Si-B alloys after heat treatment. Transmission electron microscopy observations confirmed the existence of nanocrystalline structure after annealing at 490°C and 550°C for all samples. The crystallization temperature of FeSi phase and the temperature at which the polycrystalline transformation starts were determined from temperature dependence of electrical resistivity. Aluminium slightly decreases the first crystallization temperature and considerably decreases the saturation magnetostriction in as-quenched state.
Źródło:
Acta Physica Polonica A; 2000, 97, 5; 741-744
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electric Conductivity of $(Bi_{1-x}La_{x}FeO_{3})_{0.5}(PbTiO_{3})_{0.5}$ Ceramics Obtained from Mechanosynthesized Nanopowders
Autorzy:
Markiewicz, E.
Hilczer, B.
Balcerzak, M.
Jurczyk, M.
Powiązania:
https://bibliotekanauki.pl/articles/1375503.pdf
Data publikacji:
2014-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.07.Bc
81.07.Wx
81.20.Ev
75.85.+t
81.40.Rs
Opis:
Electric conductivity of $(Bi_{1-x}La_{x}FeO_{3})_{0.5}(PbTiO_{3})_{0.5}$ ceramics obtained from nanopowders synthesized by high-energy milling from respective oxides was studied in the frequency range 10 mHz ÷ 1 GHz. At room temperatures the low-frequency conductivity was found to be dominated by the contribution from poor-conducting grain boundaries, whereas the contribution in the range 1 kHz ÷ 1 MHz, due to the grain interior, was related by us to the small polaron hopping. Moreover, the electron exchange between ferric and ferrous ions activated at higher frequencies was found to be added to the conductivity above ≈ 1 MHz.
Źródło:
Acta Physica Polonica A; 2014, 126, 4; 971-974
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the Mechanism of H-Induced Curie-Point Relaxation in Fe-Based Glassy Alloys
Autorzy:
Balla, S.
Kováč, J.
Novák, L.
Lovas, A.
Powiązania:
https://bibliotekanauki.pl/articles/1813523.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.23.Cq
71.55.Jv
75.50.Kj
81.40.Rs
Opis:
In Fe based glasses not solely the stress-sensitive magnetic properties, but also the amorphous Curie temperature $(T_C^{am})$ can be altered by hydrogen absorption or due to the low temperature "heat treatments" in liquid $N_2$ (-196°C). The sign and magnitude of this $T_C^{am}$ shift is strongly compositional dependent, but it is also influenced by the thermal history of glasses (heat treatments). In this paper new experimental results are presented, which were obtained on FeCrB alloys, supporting the previous observations. An attempt of interpretation of the results is also made, which is based on the existence of the quenched-in phase reminiscences, being inherited from the liquid structure.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 55-59
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phase Relations in Gd$\text{}_{2}$O$\text{}_{3}$-CeO$\text{}_{2}$-CuO System at 980°C. Part I
Autorzy:
Horyń, R.
Sikora, A.
Bukowska, E.
Powiązania:
https://bibliotekanauki.pl/articles/2041467.pdf
Data publikacji:
2004-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
64.75.+g
81.40.Rs
75.50.-y
72.20.My
Opis:
Phase equilibria in Gd$\text{}_{2}$O$\text{}_{3}$-CeO$\text{}_{2}$-CuO system were studied based on samples obtained from appropriate mixtures of the starting components, prepared by a conventional solid state reaction in air. The phase relations prevalent in this system have been deduced based on X-ray diffraction of well-equilibrated samples. An isothermal cross-section diagram through the system at 980°C is presented and chemical constitution of the Ce-doped Gd$\text{}_{2}$CuO$\text{}_{4}$ phase is proposed.
Źródło:
Acta Physica Polonica A; 2004, 106, 5; 727-731
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phase and Structural Study of Self-Doped La$\text{}_{1-x-y}$Ca$\text{}_{x}$Ø$\text{}_{y}$MnO$\text{}_{3+δ}$
Autorzy:
Figueiras, F.
Araújo, J. P.
Amaral, V. S.
Tavares, P. B.
Lopes, A. B.
Vieira, J. M.
Powiązania:
https://bibliotekanauki.pl/articles/2037125.pdf
Data publikacji:
2004
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
64.75.+g
81.40.Rs
75.50.-y
72.20.My
Opis:
To understand the combined effect of divalent ion and A-site vacancy (Ø) self-doping, beyond the binary La$\text{}_{1-x}$MnO$\text{}_{3}$ system, polycrystalline La$\text{}_{1-x-y}$Ca$\text{}_{x}$Ø$\text{}_{y}$MnO$\text{}_{3+δ}$ samples were studied. Samples with Ca substitution and excess Mn in the range x<0.33 and y<0.45, respectively, were prepared by standard solid-state reactions. Structural and phase analysis of the samples were done by X-ray diffraction and transmission electron microscopy. The manganite structure in this composition range includes rhombic and orthorhombic phases. Most samples contain the hausmanite phase (Mn$\text{}_{3}$O$\text{}_{4}$) coexisting with the manganite phase. A small amount of perovskite related AMn$\text{}_{7}$O$\text{}_{12}$ (A=La,Ca) structure near the hausmanite-manganite boundary is also found in samples treated in oxygen atmosphere. The calculated vacancy content accommodated in the manganite phase can be higher than 1/8, the reported limit for La$\text{}_{1-x}$MnO$\text{}_{3}$, which is confirmed in our x=0 sample. For the compositions studied, a ferromagnetic metallic behavior below T$\text{}_{C}$ is found, confirming the stability of the Mn sublattice, and near the optimum stoichiometric ((x=0. 33, y=0) system, a net A-site vacancy content (up to y=0.2) does not degrade the magnetic and electric properties.
Źródło:
Acta Physica Polonica A; 2004, 105, 1-2; 173-182
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Properties of Oxygen Deficient Y$\text{}_{0.33}$Sr$\text{}_{0.67}$CoO$\text{}_{3-δ}$
Autorzy:
Zhang, Y. F.
Sasaki, S.
Yanagisawa, O.
Izumi, M.
Powiązania:
https://bibliotekanauki.pl/articles/2047221.pdf
Data publikacji:
2007-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.80.Ga
75.60.-d
75.70.Rf
81.40.Rs
Opis:
We studied magnetic properties of perovskite-type Y$\text{}_{0.33}$Sr$\text{}_{0.67}$ CoO$\text{}_{2.614}$ and Y$\text{}_{0.33}$Sr$\text{}_{0.67}$CoO$\text{}_{2.707}$ prepared under different sintered temperatures at 1250ºC and 1100ºC, respectively. A dc magnetization jump associated with a large thermal hysteresis around 180 K was found in Y$\text{}_{0.33}$Sr$\text{}_{0.67}$CoO$\text{}_{2.614}$, which indicates a kind of magnetic memory effect. On the other hand, Y$\text{}_{0.33}$Sr$\text{}_{0.67}$CoO$\text{}_{2.707}$ shows a larger magnetization with a small magnetization jump around 200 K and lower Curie temperature than those of Y$\text{}_{0.33}$Sr$\text{}_{0.67}$CoO$\text{}_{2.614}$. Rich Co$\text{}^{3+}$ ions in the low temperature sintered Y$\text{}_{0.33}$Sr$\text{}_{0.67}$CoO$\text{}_{2.707}$ possibly introduce large magnetization and high magnetization jump temperature. This may be coming from a surface/volume effect of Co$\text{}^{3+}$ ions appearing in the polycrystalline sample prepared at low temperature. The ferromagnetism resulted from the different surface/volume ratio contributes to a part of magnetization and may result in the change of the Curie temperature.
Źródło:
Acta Physica Polonica A; 2007, 111, 1; 79-86
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ion Irradiation of Oxidized FeCoZr-CaF₂ Nanocomposite Films for Perpendicular Magnetic Anisotropy Enhancement
Autorzy:
Kasiuk, J.
Fedotova, J.
Przewoźnik, J.
Kapusta, C.
Skuratov, V.
Svito, I.
Bondariev, V.
Kołtunowicz, T.
Powiązania:
https://bibliotekanauki.pl/articles/1030130.pdf
Data publikacji:
2017-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Tt
75.30.Gw
81.15.Jj
81.40.Wx
81.40.Rs
61.80.Jh
Opis:
The paper is focused on the results of Xe ions irradiation of nanocomposite FeCoZr-CaF₂ films synthesized in the oxygen-containing atmosphere. Combined influence of nanoparticles partial oxidation and ion irradiation with different fluences on the crystalline structure, phase composition and magnetic anisotropy is analysed by X-ray diffraction, the Mössbauer spectroscopy and vibrating sample magnetometry. The origin of the detected progressive enhancement of perpendicular magnetic anisotropy as the result of films oxidation and irradiation is discussed in the context of formation of nanoparticles oxide shells and ion tracks along the films normal.
Źródło:
Acta Physica Polonica A; 2017, 132, 2; 206-209
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of Fiber Laser Pulse Processing on Coercivity and Nanohardness of Fe-3.2Si Grain-Oriented Electrical Steel in relation with its Surface Changes and Magnetic Domains Modifications
Autorzy:
Puchý, V.
Falat, L.
Kováč, F.
Petryshynets, I.
Džunda, R.
Šebek, M.
Powiązania:
https://bibliotekanauki.pl/articles/1032305.pdf
Data publikacji:
2017-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.80.Ba
81.05.Bx
81.40.Rs
81.40.-z
75.60.Ch
79.20.Eb
Opis:
Fiber laser scribing of Fe-3.2Si grain-oriented electrical steel was carried out using three different laser pulse regimes, namely a single pulse laser regime, multipulse laser regime and multipulse laser regime with modulation of laser pulses. The samples were tested for coercivity and nanohardness before and after laser processing. Clear improvements in soft magnetic characteristics were observed for all the regimes using the lowest single pulse energy of 0.6 mJ. The best improvement i.e. the most significant decrease in coercivity was obtained after the regime with 5 pulses. Further increasing in both pulse energy and pulse number resulted only in detrimental effects on both magnetic and mechanical characteristics. Introduction of 50 kHz pulse modulation within 100-pulse laser regimes resulted in lower coercivity values in comparison with the same regimes without modulation. The major effects responsible for the observed improvement are related to optimal refinement and rearrangement of magnetic domains determined by the balance of laser-induced residual stresses and plastic deformation at the surface of the treated material. Thus the fiber laser pulse processing has been recognised as a useful and energy efficient tool in obtaining electrical steels for power transformers with lower core losses.
Źródło:
Acta Physica Polonica A; 2017, 131, 6; 1445-1449
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ion-Induced Modification of Structure and Magnetic Anisotropy in Granular FeCoZr-CaF₂ Nanocomposite Films
Autorzy:
Kasiuk, J.
Fedotova, J.
Przewoznik, J.
Kapusta, Cz.
Skuratov, V.
Milosavljevic, M.
Bondariev, V.
Koltunowicz, T.
Powiązania:
https://bibliotekanauki.pl/articles/1402191.pdf
Data publikacji:
2015-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Tt
75.30.Gw
81.15.Jj
81.40.Wx
81.40.Rs
61.80.Jh
Opis:
The paper reports on the results of structural analysis and magnetometry of granular nanocomposite films FeCoZr-CaF₂ irradiated with Xe and Kr ions at different fluences. The observed effect of enhanced perpendicular magnetic anisotropy characterizing pristine films is discussed with respect to the irradiation regimes and structural changes of the films originating from the impact of ions.
Źródło:
Acta Physica Polonica A; 2015, 128, 5; 828-831
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Deformation microstructures in metallic materials after severe plastic deformation by rolling with cyclic movement of rolls
Autorzy:
Urbańczyk-Gucwa, A.
Bednarczyk, I.
Jabłońska, M.
Rodak, K.
Powiązania:
https://bibliotekanauki.pl/articles/1075888.pdf
Data publikacji:
2016-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.20.F-
61.72.Ff
81.05.Bx
81.40.Rs
83.50.-v
Opis:
The results of the microstructure investigations of the pure Al and AlMg5 alloy and pure Cu and CuFe2 alloy after the application of severe plastic deformation implemented by rolling with the cyclic movement of the rolls are presented in this paper. The rolling with the cyclic movement of the rolls was carried out at values: the rolling rate v=1 rpm, the frequency of rolls movement f=1 Hz, the amplitude of rolls movement A=1.6 mm. Maximal values of rolling reduction at 6 passes was ε_{h}=80%. The structure of the these materials was analyzed using scanning transmission electron microscope. The quantitative studies of the substructure was performed with MET-ILO software, on the basis of images acquired on scanning transmission electron microscope. Performed substructure investigations showed that using the rolling with the cyclic movement of the rolls method can refine the microstructure of these materials to the ultrafine scale.
Źródło:
Acta Physica Polonica A; 2016, 130, 4; 975-978
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of rolling with cyclic movement of rolls method on structure and hardness of CuCr0.6 alloy
Autorzy:
Rodak, K.
Urbańczyk-Gucwa, A.
Radwański, K.
Powiązania:
https://bibliotekanauki.pl/articles/1058106.pdf
Data publikacji:
2016-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.20.F-
61.72.Ff
81.05.Bx
81.40.Rs
83.50.-v
Opis:
A novel severe plastic deformation method entitled rolling with cyclic movement of rolls was proposed to fabricate ultrafine grained CuCr0.6 copper alloy. The alloy in the solution treated conditions was processed by rolling with cyclic movement of rolls method by using process parameters as amplitude of rolls movement (A = 0.9 mm), frequency of rolls movement (f = 1 Hz), rolling reduction (ε_{h} = 50%) and rolling rate (v = 1, v = 2, v = 3 rpm). Light microscopy, scanning electron microscopy and a electron backscattering diffraction detector, and scanning transmission electron microscopy were used for microstructural characterization, and hardness tests for a preliminary assessment of mechanical properties. Quantitative studies of the average diameter of the subgrains d (μm) and the average diameter of the grains D (μm) were performed using the scanning electron microscopy/electron backscattering diffraction method. Misorientation angles were analyzed by the Kikuchi-line technique using TSL-OIM software. The results show that the samples underwent very high strain at the lateral areas and smaller at the central areas. As a result, the microstructure became heterogeneous and remained unchanged with change in compression rate. The transverse movement of rolls causes in the material significant effect of refining structure in peripheral areas of sample.
Źródło:
Acta Physica Polonica A; 2016, 130, 4; 1151-1154
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
NdFeB Permanent Magnets with Various Nd Content
Autorzy:
Žák, T.
Talijan, N.
Ćosović, V.
Grujić, A.
Powiązania:
https://bibliotekanauki.pl/articles/1813649.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.05.cp
76.80.+y
75.50.-y
81.07.-b
81.40.Rs
Opis:
Three kinds of commercial Nd-Fe-B based materials were compared using $\text{}^{57}Fe$ Mössbauer spectroscopy and X-ray analysis: near the $Nd_2Fe_{14}B$ stoichiometry and with both lowered and raised Nd content. Magnetically hard $Nd_2Fe_{14}B$ is present in all three materials. In the Nd-low material it is accompanied with the magnetically soft $Fe_3B$ phase, building the nanocomposite structure. In the Nd-rich sample the overstoichiometric Nd atoms seem to build separate phase of Fe-Nd solid solution. None of the materials contain significant content of phases degrading magnetic characteristics, with except of minor $Nd_{1.1}Fe_4B_4$ one.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 279-282
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of Phase Decomposition on Magnetic Structure of $Cu_{0.4}Mn_{0.3}Ni_{0.3}$ Alloy
Autorzy:
Świderska, K.
Jankowska-Kisielińska, J.
Powiązania:
https://bibliotekanauki.pl/articles/1385743.pdf
Data publikacji:
2015-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.05.F-
64.75.-g
75.40.-s
75.47.Np
75.50.Ee
81.40.Rs
Opis:
The purpose of present investigation was to study the effects of phase decomposition of the $Cu_{0.4}Mn_{0.3}Ni_{0.3}$ alloy on its magnetic ordering. The single-crystal sample was examined by elastic neutron scattering before and after five subsequent annealing runs. The results indicate that in small fraction of the quenched sample volume there are two types of antiferromagnetic order: one of them AF1 of the long range, the other one of the short range. Ageing induces phase decomposition which yields disappearance of AF1 long range order and increase of the volume of new ordered phase. The results of the investigations of the aged sample indicate that regions of new tetragonal phase exhibit antiferromagnetic ordering with magnetic moments of Mn atoms arranged as in the pure compound MnNi but with unequal domain distribution. The intensity of magnetic component of super-structure reflections increases with the duration of ageing at lower rate than component due to atomic order.
Źródło:
Acta Physica Polonica A; 2015, 127, 2; 394-396
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Sm and Yb Pollution on Superconducting Properties of YBCO Bulk Superconductors
Autorzy:
Volochová, D.
Jurek, K.
Radušovská, M.
Piovarči, S.
Antal, V.
Kováč, J.
Jirsa, M.
Diko, P.
Powiązania:
https://bibliotekanauki.pl/articles/1371573.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.60.Bf
74.72.-h
81.40.Rs
74.25.Ha
74.81.Bd
74.25.Op
Opis:
$YBa_{2}Cu_{3}O_{7-δ }$ (YBCO, Y-123) bulk superconductors with a nominal composition $Y_{1.5}Ba_{2}Cu_{3}O_{x}$ and 1 wt% $CeO_{2}$ addition were prepared by the Top Seeded Melt Growth (TSMG) process. Small single-crystalline pieces, cut from the $SmBa_{2}Cu_{3}O_{y}$ (Sm-123) bulk, were used for seeding of epitaxial growth. Wavelength-dispersive spectrometry (WDS) confirmed the presence of 0.1 wt% Sm from the seed and 0.25 wt% Yb from the substrate, practically in the whole sample volume. The influence of this Sm and Yb contamination on superconducting properties of grown bulk materials is reported.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 358-359
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mott-Schottky Analysis of the $P3HT:ZnS_\text{cubic}$ and $P3HT:ZnS_\text{hexa}$ Bulk Heterojunction Solar Cells
Autorzy:
Abdul Kareem, T.
Powiązania:
https://bibliotekanauki.pl/articles/1398356.pdf
Data publikacji:
2016-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.85.Rs
73.40.Lq
73.40.Sx
73.50.Pz
73.61.Ga
73.61.Ph
73.63.Bd
81.05.Dz
88.40.jp
88.40.jr
Opis:
Bulk heterojunction solar cells of sphalerite and wurtzite ZnS incorporated P3HT were fabricated and their Mott-Schottky analysis was performed to find the conduction mechanism of the devices. The analysis shows the formation of a Schottky junction and band unpinning at the P3HT:ZnS-Al contact and it confirms the hole conductivity in the active material.
Źródło:
Acta Physica Polonica A; 2016, 129, 3; 409-413
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-40 z 40

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