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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zamkova N. G., Zhandun V. S., Zinenko V. I.
Заглавие : Effect of Sr2+ Ion Substitution with Trivalent Ions (Sc3+, In3+, La3+, Bi3+) on Its Ferroelectric Instability in SrTiO3
Разночтения заглавия :авие SCOPUS: Effect of Sr 2+ ion substitution with trivalent ions (Sc 3+, In 3+, La 3+, Bi 3+) on its ferroelectric instability in SrTiO 3
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2011. - Vol. 53, Is. 11. - P2290-2299. - ISSN 1063-7834, DOI 10.1134/S1063783411110345
Примечания : Cited References: 14. - This study was supported by the Russian Foundation for Basic Research (project no. 09-02-00067), the Federal Program of Support for Leading Scientific Schools (project no. NSh-4645.2010.2).
Предметные рубрики: BEHAVIOR
RELAXOR
Аннотация: The vibration frequencies of unstable ferroelectric and antiferrodistortion modes and the dependences of the energy on the ion displacement amplitude have been calculated within the generalized Gordon-Kim model for distortions along eigenvectors of these modes in the mixed compounds Sr(1-x)A(x)Ti(1-x/4)square O-x/4(3) and Sr(1-y)A(2y/3)square y/3TiO3 (A = Sc3+, In3+, La3+, Bi3+; square is the vacancy). To compensate an excess positive charge, vacancies are introduced into the Ti4+ or Sr2+ site. Calculations have been performed in the "average" crystal approximation for impurity concentrations of 0.25 and 0.50. To this end, a set of 40 atomic superlattices with various orderings of heterovalent ions Sr2+ and impurity A(3+) has been considered. It has been found that each impurity type, independently of charge balance, induces ferroelectric instabilities in doped compounds. In the case of doping with In3+ and La3+ for concentration x = 0.25, the possibility of rotating the polarization vector has been shown.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zhandun V. S., Zamkova N. G., Zinenko V. I.
Заглавие : Lattice dynamics and the ferroelectric phase transition in ordered Pb-2 B'BaEuro(3)O(6) (B' = Ga, In, Lu; BaEuro(3) = Nb, Ta) solid solutions
Коллективы :
Разночтения заглавия :авие SCOPUS: Lattice dynamics and the ferroelectric phase transition in ordered Pb2 B′ B″O6 (B′ = Ga, In, Lu; B″ = Nb, Ta) solid solutions
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2010. - Vol. 52, Is. 2. - P357-363. - ISSN 1063-7834, DOI 10.1134/S1063783410020228
Примечания : Cited References: 19. - This study is supported by the Russian Foundation for Basic Research (project no. 09-02-00067) and the Council on Grants from the President of the Russian Federation for Support of the Leading Scientific Schools (grant no. NSh-4137.2006.2).
Предметные рубрики: PEROVSKITES
CRYSTALS
DISORDER
RELAXOR
BATIO3
PBTIO3
Аннотация: The lattice vibration spectrum, rf permittivity, and dynamic Born charges have been calculated for ordered Pb-2 B'BaEuro(3)O(3) (B'=Ga, In, Lu; BaEuro(3)=Nb, Ta) solid solutions in terms of the generalized Gordon-Kim model. It has been shown that all compounds exhibit a ferroelectric instability and that the frequencies of "soft" ferroelectric modes are close in magnitude. The ferroelectric phase-transition temperatures and the spontaneous polarization in the ferroelectric phase of the solid solutions under consideration have been calculated by the Monte Carlo method using the model Hamiltonian in the local mode approximation. The transition temperature is found to increase with increasing atomic number of the B' ion.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zhandun V. S., Zamkova N. G., Zinenko V. I.
Заглавие : Lattice dynamics, ferroelectric and antiferroeelctric instabilities, and the ferroelectric phase transition in disordered PbB(1/2)' B(1/2)'' O(3) (B ' = Ga, In, Lu; B '' = Nb, Ta) solid solutions
Разночтения заглавия :авие SCOPUS: Lattice dynamics, ferroelectric and antiferroeelctric instabilities, and the ferroelectric phase transition in disordered PbB′ 1/2B″1/2O3 (B′ = Ga, In, Lu; B″ = Nb, Ta) solid solutions
Место публикации : J. Exp. Theor. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2008. - Vol. 106, Is. 6. - P1109-1117. - ISSN 1063-7761, DOI 10.1134/S1063776108060101
Примечания : Cited References: 29
Предметные рубрики: STATISTICAL-MECHANICS
PEROVSKITES
CRYSTALS
ORDER
RELAXOR
BATIO3
PBTIO3
Ключевые слова (''Своб.индексиров.''): crystal lattices--ferroelectricity--lattice vibrations--solids--ferroelectric (barium strontium titanate)--ferroelectric phase transitions--lattice (co)--lattice dynamics--vibration spectrum--ferroelectric materials
Аннотация: The lattice vibration spectra, rf permittivity, and dynamic Born charges of disordered PbB(1/2)'B(1/2)'' O(3) (B' = Ga, In, Lu; B '' = Nb, Ta) solid solutions are calculated in terms of the generalized Gordon-Kim model. All the compounds are found to have soft modes related to the center (Gamma(15)) and boundary point R (R(15)) of the Brillouin zone; the frequencies of these modes are close. The ferroelectric phase transition temperatures and the spontaneous polarization in the ferroelectric phase are calculated for the solid solutions using a model Hamiltonian in the local mode approximation and the Monte Carlo method. These temperatures for the tantalum compounds are found to be higher than for the niobium compounds, and temperature t(s) increases with the atomic number of ion B'. A model where the antiferroelectric state is related to the condensation of modes Gamma(15) and R(15) is proposed. It is found that, for all compounds except for PbSc(1/2)Nb(1/2)O(3) and PbSc(1/2)Ta(1/2)O(3), the ferroelectric phase, which is only related to the condensation of mode R(15), and the antiferroelectric phase have similar energies. In PbIn(1/2)Ta(1/2)O(3), the antiferroelectric phase turns out to be energetically favorable.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pugachev A. M., Zaytseva, I., V, Malinovsky V. K., Surovtsev, N., V, Gorev M. V., Ivleva L. I., Lykov P. A.
Заглавие : Temperature dependence of the spontaneous polarization, acoustic and strain anomalies in strontium barium niobate crystals of different chemical compositions probed by the second harmonic generation technique
Коллективы : Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [18-02-00399, 19-42-543-016, AAAA-A17-117052410033-9]
Место публикации : Ferroelectrics. - 2020. - Vol. 560, Is. 1. - P.54-60. - ISSN 0015-0193, DOI 10.1080/00150193.2020.1722883. - ISSN 1563-5112(eISSN)
Примечания : Cited References: 19. - This work was supported by the Russian Foundation for Basic Research, projects no. 18-02-00399 and 19-42-543-016 and State assignment No AAAA-A17-117052410033-9.
Предметные рубрики: SINGLE-CRYSTALS
RELAXOR
GROWTH
Аннотация: In SrxBa1-xNb2O6 crystals (x = 0.33, 0.5, 0.61, and 0.75), temperature dependences of spontaneous polarization, strain, elastic modules, and second harmonic generation (SHG) signal are compared. It is revealed that SHG describes the temperature dependences of dipole moments in polar nanoregions in paraelectric phase. In the vicinity of the phase transition in paraelectric phase, SHG reflects the temperature behavior of relatively large and long-lived polar asymmetric regions as indicated by the presence of the intermediate temperature range on the temperature dependence of this nonlinear response.
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