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Wyszukujesz frazę "Savytskii, D." wg kryterium: Autor


Wyświetlanie 1-5 z 5
Tytuł:
Symmetry Pattern and Domain Wall Structure in $GdFeO_{3}$ Perovskite Type
Autorzy:
Savytskii, D.
Tataryn, T.
Bismayer, U.
Powiązania:
https://bibliotekanauki.pl/articles/1550088.pdf
Data publikacji:
2010-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.72.Mm
61.72.-y
61.50.Ah
Opis:
Symmetry relations between the domain states in $GdFeO_{3}$ type crystals have been obtained using group-theoretical analysis for prototype and ferroelastic space groups. Models for possible domain pairs are developed. The ion locations on the domain boundary were estimated as intermediate positions between the sites in crystal structure of neighboring domain states. It is shown that the crystalline structure of the boundary approaches to the prototype phase structure - the ideal $ABO_{3}$ perovskite-type structure, however certain deformations remain. In addition to the shifts of the all ions the tilts of oxygen octahedra of the some type and related displacements of A ions should take place during the switching of orientation states. The tilts of octahedra and displacements of A ions are sufficient to form translation states (antiphase domains). Antiphase domains can have boundaries between themselves basically along the three faces of the orthorhombic cell.
Źródło:
Acta Physica Polonica A; 2010, 117, 1; 78-85
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Theoretical Study of the Ferroelastic Domain Structure in $La_{0.95}Sr_{0.05}Ga_{0.9}Mg_{0.1}O_{3-x}$
Autorzy:
Savytskii, D.
Tataryn, T.
Martynyuk, N.
Bismayer, U.
Powiązania:
https://bibliotekanauki.pl/articles/1550058.pdf
Data publikacji:
2010-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.72.Mm
61.72.-y
61.50.Ah
Opis:
Theoretical analysis of the ferro-elastic domain structure of a $La_{0.95}Sr_{0.05}Ga_{0.9}Mg_{0.1}O_{2.925}$ crystal in three different crystallographic phases is presented. Parameters of these configurations are obtained using group theoretical approach, the method of spontaneous deformation as well as theoretical interpretation of twinning resulting from mechanical deformation (mechanical twinning theory). In the three phases of $La_{0.95}Sr_{0.05}Ga_{0.9}Mg_{0.1}O_{2.95}$ - trigonal, orthorhombic and monoclinic - the parameters of ferro-elastic domain structures are determined; namely the quantity of orientation states, symmetry elements of connection between states, orientations and types of domain walls, tensors of spontaneous deformations of the perovskite-type cells for every orientation state, elements of twin shifts, which are needed for the reorientation of some orientation states to others. By using the found parameters of bidomain configurations a mechanism is proposed, which causes chevron-like domain configurations in compounds with martensitic phase transitions.
Źródło:
Acta Physica Polonica A; 2010, 117, 1; 48-61
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Identification of the Domain Walls Configuration in the Ferroelastic Nanosize Material $La_{0.95}Sr_{0.05}Ga_{0.9}Mg_{0.1}O_{3-x}$
Autorzy:
Savytskii, D.
Paulmann, C.
Bismayer, U.
Berkowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/1550061.pdf
Data publikacji:
2010-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.72.Mm
61.72.-y
61.50.Ah
Opis:
This paper deals with the identification of multidomain configuration in ferroelastic phases of $La_{0.95}Sr_{0.05}Ga_{0.9}Mg_{0.1}O_{3-x}$ using polychromatic synchrotron X-ray radiation (Laue method). A nondestructive approach for the determination of domain misorientations, orientation of domain walls and their configuration in the nanosize ferroelastic domain structure was developed. The proposed approach can be used to study the nanosize ferroelastic domain structure in small crystals of submillimeter sizes at different external fields, including temperature. The ferroelastic domain structure in the orthorhombic as well as in the rhombohedral phases of $La_{0.95}Sr_{0.05}Ga_{0.9}Mg_{0.1}O_{3-x}$ crystals has been identified. The intersection of walls leads to the formation of a chevron-like pattern. The observed reversibility of domain patterns during temperature cycles is probably caused by the interaction of domain boundaries with point defects, most likely oxygen vacancies.
Źródło:
Acta Physica Polonica A; 2010, 117, 1; 62-73
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Orientation States in Rhombic NdGaO$\text{}_{3}$
Autorzy:
Savytskii, D. I.
Ubizskii, S. B.
Vasylechko, L. O.
Syvorotka, I. M.
Matkovskii, A. O.
Powiązania:
https://bibliotekanauki.pl/articles/1964528.pdf
Data publikacji:
1997-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.72.Mm
62.20.Dc
Opis:
The ferroelastic domain structure of NdGaO$\text{}_{3}$ is analyzed by three theories: group symmetry, tensor method and twinning by pseudosymmetry. The theories provide a coherent description of domain pairs and a determination of the position of W and S walls.
Źródło:
Acta Physica Polonica A; 1997, 92, 1; 231-236
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of Colour Centres in SrLaAlO$\text{}_{4}$ and SrLaGaO$\text{}_{4}$ Single Crystals
Autorzy:
Ubizskii, S. B.
Savytskii, D.I.
Olijnyk, V. Ya.
Matkovskii, A. O.
Gloubokov, A.
Pajączkowska, A.
Powiązania:
https://bibliotekanauki.pl/articles/1964350.pdf
Data publikacji:
1997-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.82.Ms
Opis:
Absorption spectra of SrLaAlO$\text{}_{4}$ and SrLaGaO$\text{}_{4}$ single crystals are investigated as well as their changes after irradiation by γ-quanta ($\text{}^{60}$Co source). Both crystals reveal a similar behaviour that is caused, as it seems, by the same nature of colour centres in them. The conclusion that oxygen defects as well as Fe impurities play a significant role in the colour centres formation in these crystals.
Źródło:
Acta Physica Polonica A; 1997, 92, 1; 163-168
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-5 z 5

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