Сибирский федеральный университет

Тип публикации: статья из журнала

Год издания: 2017

Идентификатор DOI: 10.1134/S1063783417050250

Аннотация: The thermal, optical, and dielectric properties of fluoride Rb2TaF7 were investigated. It was observed that the variation in chemical pressure in fluorides A2 +TaF7 caused by the cation substitution of rubidium for ammonium does not affect the ferroelastic nature of structural distortions, but leads to stabilization of the high- and low-temperature phases and enhancement of birefringence. The entropy of the phase transition P4/nmm ↔ Cmma is typical of the shift transformations, which is consistent with a model of the initial and distorted phase structures. The anisotropy of chemical pressure causes the change of signs of the anomalous strain and baric coefficient dT/dp of Rb2TaF7 as compared with the values for its ammonium analog.

Журнал: Physics of the Solid State

Выпуск журнала: Т. 59, № 5

Номера страниц: 986-991

ISSN журнала: 10637834

Место издания: Санкт-Петербург

Издатель: Pleiades Publishing, Ltd. (Плеадес Паблишинг, Лтд)

• Pogorel'tsev E.I. (Siberian Federal University)
• Mel'nikova S.V. (Kirensky Institute of Physics,Federal Research Center,Siberian Branch,Russian Academy of Sciences)
• Kartashev A.V. (Krasnoyarsk State Pedagogical University)
• Gorev M.V. (Siberian Federal University)
• Flerov I.N. (Siberian Federal University)
• Laptash N.M. (Institute of Chemistry,Far East Branch,Russian Academy of Sciences)

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