Mechanism and nature of phase transitions in the (NH4) 3MoO3F3 oxyfluoride

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Тип публикации: статья из журнала

Год издания: 2008

Идентификатор DOI: 10.1007/s11451-008-3021-9

Аннотация: The temperature dependences of the heat capacity, the unit cell parameter, and the permittivity for the (NH4)3MoO3F 3 cryolite (space group Fm \overline 3 m) are investigated. It is revealed that the compound undergoes ferroelectric and ferroelastic structural phase transitions at temperatures of 297 and 205 K, respectively. The meПоказать полностьюchanism of structural distortions is discussed in terms of the entropy parameters, pressure-temperature phase diagrams, and electron density maps for critical atoms. An analysis is made of the influence of the cation size and shape on the phase transitions in oxyfluorides of the general formula A 2 A?MO3 (A,A? = NH4, K; M = Mo, W). © 2008 Pleiades Publishing, Ltd.

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Издание

Журнал: Physics of the Solid State

Выпуск журнала: Vol. 50, Is. 3

Номера страниц: 515-524

ISSN журнала: 10637834

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