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Tytuł:
Microstructure evaluation of Ni-Mn-Ga alloy
Mikrostruktura stopu Ni-Mn-Ga
Autorzy:
Flaga, S.
Kata, D.
Sapiński, B.
Powiązania:
https://bibliotekanauki.pl/articles/368870.pdf
Data publikacji:
2010
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
MSMA
stop Ni-Mn-Ga
Ni-Mn-Ga alloy
Opis:
This paper summarises the applications of MSMA materials, outlines the mechanism of magnetic shape memory effect and provides the procedure for microstructure evaluation of samples as well as the results of microstructure analysis using the example of the Ni-Mn-Ga alloy.
W artykule scharakteryzowano zastosowania materiałów z magnetyczną pamięcią kształtu (MSMA). Opisano mechanizm działania magnetycznej pamięci kształtu. Przedstawiono procedurę mikroskopowej oceny próbki i jej wyniki na przykładzie stopu Ni-Mn-Ga.
Źródło:
Mechanics and Control; 2010, 29, 1; 6-10
2083-6759
2300-7079
Pojawia się w:
Mechanics and Control
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructure of V3Ga superconducting wire using high Ga content Ti-Ga/V precursor composite material
Mikrostruktura nadprzewodzącego drutu V3Ga wytworzonego przy użyciu związku TiGa3 o wysokiej zawartości Ga
Autorzy:
Murakami, S.
Matsuda, K.
Kawabata, T.
Hishinuma, Y
Ikeno, S.
Powiązania:
https://bibliotekanauki.pl/articles/355932.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
superconductor
Ti-Ga/V precursor composite material
V-Ga phase
TEM
microstructure
drut nadprzewodzący
Ti-Ga/V materiał kompozytowy
faza V-Ga
mikrostruktura
Opis:
Our co-workers, Hishinuma et. al. have fabricated the V3Ga compound wire by a new process using a high Ga content Ti-Ga compound in order to improve the superconducting property of the wire. In this study, we investigated microstructures of this wire to clarify the existence of V3Ga phase. The different contrasts of the matrix, two V-Ga phases and Ti-Ga core were observed by SEM observation. Two V-Ga phases were also confirmed. The ratio of V to Ga for two V-Ga phases was respectively 3:1 and 6:5 according to the EDS result. And these two phases were confirmed as V3Ga and V6Ga5.
Hishinuma i współpracownicy wytworzyli drut związku międzymetalicznego V3Ga przy użyciu nowej metody wykorzystującej związek międzymetaliczny Ti-Ga o wysokiej zawartości Ga celem poprawy właściwości nadprzewodzących drutu. Zbadaliśmy mikrostrukturę drutu, aby zweryfikować obecność fazy V3Ga. W trakcie badań SEM zaobserwowano zróżnicowany kontrast w osnowie oraz istnienie dwóch faz V-Ga i rdzenia T-Ga. Analiza EDS potwierdziła istnienie dwóch faz z układu V-Ga, w których stosunek V do Ga wynosi odpowiednio 3:1 i 6:5. Potwierdzono, ze te dwie fazy to V3Ga i V6Ga5.
Źródło:
Archives of Metallurgy and Materials; 2013, 58, 2; 325-326
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of a radiolabeled glucagon compound for imaging
Autorzy:
Jalilian, A. R.
Jouiaei, M.
Doroudi, A. R.
Bolourinovin, F.
Garousi, J.
Powiązania:
https://bibliotekanauki.pl/articles/148402.pdf
Data publikacji:
2010
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
glucagons
radiolabeling
biodistribution
Ga-67
Opis:
In order to develop a possible Ga-labeled glucagon (GCG) compound for imaging studies, biosynthetic glucagon (GCG) was labeled with [67Ga]-gallium chloride after conjugation with freshly prepared diethylenetriaminepentaacetic acid dianhydride (ccDTPA). After solid phase purification of the radiolabeled hormone, high performance liquid chromatography (HPLC) and instant thin-layer chromatography (ITLC) showed a radiochemical purity around 95 per cent in optimized conditions (specific activity = 296–370 GBq/mM; labeling efficiency 85 per cent). Preliminary in vivo studies (IDźg–1 per cent) in male wild-type rats showed heart:muscle, liver:muscle, lung:muscle and stomach:muscle ratios to be 5.53, 2.9, 7.56, 3.69, 3.2 (in 5 min), respectively while after 2 h liver:blood, lung:blood and spleen:blood ratios were 14.21, 16.86 and 7.8, respectively. The data suggests 5 min post injection, the tracer is accumulated in GCGR rich tissues which is in agreement with biodistribution studies and reported GCG receptors (GCGRs). The results of the present study can possibly offer a candidate for non-invasive imaging of glucagon receptor related diseased and malignancies such as glucagonoma.
Źródło:
Nukleonika; 2010, 55, 2; 219-224
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mössbauer study of vacuum annealed Fe100-xGax (10 less - than or equal to x less - than or equal to 35) thin films
Autorzy:
Szumiata, T.
Górka, B.
Brzózka, K.
Gawroński, M.
Gzik-Szumiata, M.
Javed, A.
Morley, N. A.
Gibbs, M. R. J.
Powiązania:
https://bibliotekanauki.pl/articles/147332.pdf
Data publikacji:
2013
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
Fe-Ga
thin films
CEMS
MOKE
Opis:
This work reports results from comparative Mossbauer studies of as-deposited and annealed Fe100.xGax (10 less - than or equal to x less - than or equal to 35) high magnetostrictive thin films of constant thickness (50 plus or minus 2 nm). Films were grown on Si(100) substrates using a co-sputtering and evaporation chamber where Fe has been sputtered and Ga was evaporated. During growth of films, a magnetic field of 65 kA/m has been applied in the plane of the film. Annealed films have been obtained by heating in vacuum for 1 h at 350 centigrade without magnetic field. After annealing, the saturation field of the Fe-Ga films has been significantly reduced. By means of the 57Fe CEMS technique the contributions from several phases have been found: Fe-Ga A2 (bcc), traces of DO3 phase, a gallium-rich disordered phase and iron oxides (both geothite and magnetite). For the sample with x = 26.5 the heat treatment reduces the DO3 phase content whereas for the film with x = 16.4 the opposite tendency has been observed. Mossbauer results were compared with XRD and MOKE findings.
Źródło:
Nukleonika; 2013, 58, 1; 27-30
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical and electrical properties of highly doped ZnO:Al films deposited by atomic layer deposition on Si substrates in visible and near infrared region
Autorzy:
Romanyuk, V.
Dmitruk, N.
Karpyna, V.
Lashkarev, G.
Popovych, V.
Dranchuk, M.
Pietruszka, R.
Godlewski, M.
Dovbeshko, G.
Timofeeva, I.
Kondratenko, O.
Taborska,, M.
Ievtushenko, A.
Powiązania:
https://bibliotekanauki.pl/articles/1156366.pdf
Data publikacji:
2016-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.66.Hf
73.61.Ga
Opis:
Optical properties of ZnO films doped by Al in the range 0.5 to 7 at.% and deposited by atomic layer deposition were studied in visible and infrared spectral range. Spectral dependences of film optical permittivity were modeled with the Lorentz-Drude approximation resulting in ZnO:Al plasma frequency and plasma damping parameters. We observed changing electron effective mass from 0.29m₀ to 0.5m₀ with increasing electron concentration in the range (0.9-4) × 10²⁰ due to the phenomenon of conduction band non-parabolicity. Comparing the results of optical and electrical investigations we can see that the main scattering mechanism is the scattering on grain boundaries (its contribution is about 60%).
Źródło:
Acta Physica Polonica A; 2016, 129, 1a; A-36-A-40
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Low Temperature Anomalies in the Specific Heat and Magnetic Susceptibility of $Na_{0.7}CoO_2$ Samples
Autorzy:
Baran, A.
Zorkovská, A.
Feher, A.
Šebek, J.
Šantavá, E.
Hejtmánek, J.
Veverka, M.
Bradarić, I.
Ružička, M.
Powiązania:
https://bibliotekanauki.pl/articles/1813849.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.40.Cx
72.80.Ga
Opis:
We present a comparative study of $Na_{0.7}CoO_2$ samples obtained from three different sources and prepared by different methods. The specific heat and magnetic susceptibility measurements in the temperature range 2-300 K show substantial influence on the observed anomalies, which underlines that the system is extremely sensitive to preparation protocols.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 495-498
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural and Optical Studies of CdTe/ZnTe Superlattices with Ultrathin ZnTe Layers
Autorzy:
Mariette, H.
Jouneau, P. H
Pelekanos, N. T.
Tardot, A.
Feuilet, G.
Magnea, N.
Powiązania:
https://bibliotekanauki.pl/articles/1929608.pdf
Data publikacji:
1993-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.66.Hf
73.61.Ga
Opis:
Spatially selective introduction of ultrathin ZnTe layers (1 to 3 mono-layers) into CdTe allows the study of special superlattice structure, corresponding to a monomolecular plane-host crystal system. Particular attention is given to the strain state control of the inserted ZnTe monolayer. High resolution electron microscopy is used to measure the local lattice distortion: the method yields the location and the total amount of Zn per period, and the results are compared with X-ray diffraction data. Optical properties of these superlattices are also presented. All results show the ability to control ultrathin pseudomorphic layers of ZnTc within CdTe, with limited Zn segregation, and of high crystalline and optical quality. In addition, they can be fitted within the framework of elasticity theory for the structural data, and of a finite quantum well model for the optical ones, even in the ultimate limit of only one nominal ZnTe monolayer.
Źródło:
Acta Physica Polonica A; 1993, 84, 3; 423-433
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quasiparticles in Calcium Doped Yttrium-Iron Garnets
Autorzy:
Lehmann-Szweykowska, A.
Wojciechowski, R. J.
Gehring, G. A.
Tobijaszewski, I.
Powiązania:
https://bibliotekanauki.pl/articles/1955836.pdf
Data publikacji:
1997-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.20.Jv
72.80.Ga
Opis:
In yttrium-iron garnets an electrical charge is carried by quasiparticles based on compensating holes which move either at oxygen or iron ions of the tetragonal sublattice. The quasiparticles can also get localized because of their coupling to optical phonons on the iron sites. A multi-band model of holes coupled to phonons is applied to find additional energy levels in the gap between the lower of the narrow 3d bands and the wide 2p band, whose occurrence plays a crucial role in a conductivity mechanism. The density of states is considerably modified by the interaction between the holes and local distortion of the lattice.
Źródło:
Acta Physica Polonica A; 1997, 91, 2; 423-426
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of CdTe/Cd$\text{}_{1-x}$Mg$\text{}_{x}$Te Double Barrier, Single Quantum Well Heterostructures for Resonant Tunneling
Autorzy:
Reuscher, G.
Keim, M.
Fischer, F.
Waag, A.
Landwehr, G.
Powiązania:
https://bibliotekanauki.pl/articles/1933964.pdf
Data publikacji:
1995-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.20.Dx
73.61.Ga
Opis:
We report the first observation of resonant tunneling through a CdTe/Cd$\text{}_{1-x}$Mg$\text{}_{x}$Te double barrier, single quantum well heterostructure. Negative differential resistance is observable at temperatures below 230 K, exhibiting a peak to valley ratio of 3:1 at 4.2 K.
Źródło:
Acta Physica Polonica A; 1995, 88, 5; 885-888
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hydrostatic Pressure Study of MBE CdMnTe Doped with Bromine
Autorzy:
Szczytko, J.
Wasik, D.
Przybytek, J.
Baj, M.
Waag, A.
Powiązania:
https://bibliotekanauki.pl/articles/1934026.pdf
Data publikacji:
1995-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.55.Gs
73.61.Ga
Opis:
We present Hall effect and resistivity measurements as a function of pressure performed on MBE-grown Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te (with x = 0.14) layer (1 μm) doped with bromine. The experimental data were analysed using positive and negative U model of the Br centres. We found that both models could reproduce the experimental points, but in the case of positive U model - only under assumption that the sample was completely uncompensated.
Źródło:
Acta Physica Polonica A; 1995, 88, 5; 933-936
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Injection of Optically Generated Spins through Magnetic Nonmagnetic Heterointerface: Ruling out Possible Detection Artifacts
Autorzy:
Ghali, M.
Kossut, J.
Janik, E.
Powiązania:
https://bibliotekanauki.pl/articles/2038227.pdf
Data publikacji:
2004-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.67.-n
73.61.Ga
Opis:
We report on injection of optically created spin-polarized carriers into CdTe-based materials. The injected spins are initially aligned in a diluted magnetic semiconductor CdMnTe layer located on the top of CdMgTe layer in CdMnTe/CdMgTe spintronic generic model structures. A critical discussion of possible artifacts that may complicate the spin detection and its quantitative analysis is given. Although the spin injection efficiency, 80%, has been found by us to be basically independent of the thickness of the spin detecting layer, there is an essential difference between thin and wide detectors related to the strain-induced lifting of the valence band degeneracy in the former, when assessing the efficiency of the spin injection. Most importantly, we observe an effect of switching the spin injection process on and off by an external magnetic field variation within a relatively narrow field range. This effect can be achieved by a careful design of the interface between the diluted magnetic semiconductor and the non-magnetic semiconductor.
Źródło:
Acta Physica Polonica A; 2004, 106, 2; 207-214
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Two-Electron DX State in CdTe:In
Autorzy:
Skierbiszewski, C.
Wiśniewski, P.
Litwin-Staszewska, E.
Suski, T.
Wilamowski, Z.
Zakrzewski, A. K.
Karczewski, G.
Jantsch, W.
Powiązania:
https://bibliotekanauki.pl/articles/1952096.pdf
Data publikacji:
1996-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.55.Gs
73.61.Ga
Opis:
In this paper we investigate electron emission/capture from/to the DX state of indium in CdTe by means of high pressure freeze-out cycle and steady-state photo-conductivity experiments. The results indicate that the DX state is occupied by two electrons. A comparison with deep level transient spectroscopy data shows that two-electron emission occurs at low temperatures, while one-electron emission takes place at high temperatures.
Źródło:
Acta Physica Polonica A; 1996, 90, 5; 927-930
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Deep Electron Traps in CdTe:In Films Grown by Molecular Beam Epitaxy
Autorzy:
Żakrzewski, A. K.
Dobaczewski, L.
Karczewski, G.
Wojtowicz, T.
Kossut, J.
Powiązania:
https://bibliotekanauki.pl/articles/1934051.pdf
Data publikacji:
1995-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.55.Ln
73.61.Ga
Opis:
N-type indium doped CdTe grown on n$\text{}^{+}$-GaAs by molecular beam epitaxy has been studied by the standard deep level transient spectroscopy and the isothermal Laplace-transform deep level transient spectroscopy. It was found that the Cd/Te flux ratio strongly influences the deep level transient spectroscopy results. The unusual temperature dependence of the electron emission rate in films grown at nearly stoichiometric conditions may point out that the observed defect is resonant with the conduction band.
Źródło:
Acta Physica Polonica A; 1995, 88, 5; 961-964
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Absorption of Thin ZnSe, ZnS and ZnS$\text{}_{x}$Se$\text{}_{1-x}$ Films under High Hydrostatic Pressure
Autorzy:
Griebl, E.
Schőtz, G.
Birzer, Ch.
Kerner, W.
Reisinger, T.
Hahn, B.
Gebhardt, W.
Powiązania:
https://bibliotekanauki.pl/articles/1934060.pdf
Data publikacji:
1995-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.61.Ga
71.35.+z
Opis:
We present absorption measurements on free-standing ZnSe, ZnS and ZnS$\text{}_{x}$Se$\text{}_{1-x}$ films (d = 0.4...2 μm) under hydrostatic pressure up to 15 GPa. The refraction index n(λ,P) of ZnS and ZnSe in the transparent region up to 800 nm and the pressure shift of the E0 absorption edge of ZnSe and some ZnS$\text{}_{x}$Se$\text{}_{1-x}$-compositions was investigated at 293 K. At 2 K free exciton states near the E$\text{}_{0-}$ and E$\text{}_{0}$ + Δ$\text{}_{0}$-gap are visible in absorption. Increase in the Rydberg energy under pressure was found, which is explained with k • p-theory in the framework of the hydrogen model.
Źródło:
Acta Physica Polonica A; 1995, 88, 5; 995-999
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Indium Doping of CdTe Grown by Molecular Beam Epitaxy
Autorzy:
Karczewski, G.
Zakrzewski, A.
Kutrowski, M.
Jaroszyński, J.
Dobrowolski, W.
Grodzicka, E.
Janik, E.
Wojtowicz, T.
Kossut, J.
Barcz, A.
Powiązania:
https://bibliotekanauki.pl/articles/1932089.pdf
Data publikacji:
1995-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.55.Ln
73.61.Ga
Opis:
We report on n-type indium doping of CdTe films grown by molecular beam epitaxy on (001) GaAs substrates. By adjusting the flux of In atoms we can precisely control the carrier concentration over three orders of magnitude - from 8 × 10$\text{}^{14}$ up to 1.3 × 10$\text{}^{18}$ cm$\text{}^{-3}$. In agreement with earlier reports we confirmed that Cd overpressure plays an important role in the doping process. The doping appears to be most effective for Cd/Te pressure ratio of 1.5. For this value of Cd/Te pressure ratio essentially 100% efficiency of doping is achieved at low In concentrations (< 10$\text{}^{18}$ cm$\text{}^{-3}$). At higher In concentrations acceptor impurities compensate shallow donors limiting the concentration of free carriers.
Źródło:
Acta Physica Polonica A; 1995, 87, 1; 241-244
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 145

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