Перевод заглавия: "Псевдособственный" сегнетоэлектрический фазовый переход в оксифториде K3WO3F3
Рубрики:
TRANSFORMATIONS
(NH4)(3)MOO3F3
(NH4)(3)WO3F3
CS
Кл.слова (ненормированные):
phase transition -- statistical mechanics -- order-disorder -- ferroelectric -- TRANSFORMATIONS -- (NH4)(3)MOO3F3 -- (NH4)(3)WO3F3 -- CS
Аннотация: Based on the structural data on the phases of cryolite (ordered perovskite) K3WO3F3, we develop a statistical model, which allows to describe the sequence of phase transitions observed in this compound using a unified approach. According to the model, the crystal possesses two structural subsystems: the K cations located in the octahedral positions and the WO3F3 octahedra in positions alternating with K cations. In the symmetric (cubic) phase, each subsystem can be found in one of the eight states. At decreasing temperature, an orientational phase transition in the subsystem of octahedra occurs first, followed by a phase transition to the low-temperature phase, caused by the loss of stability with respect to the ordering in the K cation subsystem. We find that the electric polarization occurs as pseudoproper and discuss the mechanisms of formation of the phase states.
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Держатели документа:
Southern Fed Univ, Inst Phys Res, Rostov Na Donu, Russia
Siberian Fed Univ, Inst Phys Engn & Radioelect, Krasnoyarsk, Russia
Siberian Dept RAS, Kirensky Inst Phys, Krasnoyarsk, Russia
Доп.точки доступа:
Ivliev, M. P.; Misyul, S. V.; Мисюль, Сергей Валентинович; Molokeev, M. S.; Молокеев, Максим Сергеевич; Sakhnenko, V. P.