Ferroelectric phase transitions in ionic conductors based on bismuth vadanate

Politova, E.D.; Fortal’nova, E.A.; Kaleva, G.M.; Mosunov, A.V.; Andronova, L.I.; Andropova, S.A.; Safronenko, M.G.; Venskovskiĭ, N.U.

Авторы: Politova E.D., Fortal’nova E.A., Kaleva G.M., Mosunov A.V., Andronova L.I., Andropova S.A., Safronenko M.G., Venskovskiĭ N.U.
Журнал: Physics of the Solid State
Том: 51
Номер: 7
Год издания: 2009
Издательство: Pleiades Publishing, Ltd
Местоположение издательства: Road Town, United Kingdom
Первая страница: 1443
Последняя страница: 1448
DOI: 10.1134/s1063783409070282
Аннотация: Ceramic solid solutions (Bi1–xLax)4V2O11–z (I), Bi4(V1–xFex)2O11–y (II), and (Bi1⎯xLax)4(V0.96Fe0.04)2O11–y (III) (x = 0–0.3, step Δx = 0.02) are prepared using solid phase synthesis.The concentration and temperature ranges of stabilization of different polymorphic modifications, including the ranges of concentrations x corresponding to the stabilization of the ferroelectric phase, are established. It is revealed that an increase in the concentration x in the region of existence of the pseudoorthorhombic phase α of the solid solutions studied leads to a decrease in the transition temperature, smearing of the transition, and an increase in the width of the thermal hysteresis of the ferroelectric phase transition. The effect of compressing of the domain walls by oxygen vacancies was revealed in the samples from the region of existence of the ferroelectric α phase, and the effect of dielectric relaxation was detected in the samples from the region of existence of the orthorhombic phase β.
Добавил в систему: Мосунов Александр Викторович

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