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

Описание

Тип публикации: статья из журнала

Год издания: 2008

Идентификатор DOI: 10.1134/S1063783408030219

Аннотация: The temperature dependences of the heat capacity, the unit cell parameter, and the permittivity for the (NH4)(3)MoO3F3 cryolite (space group Fm (3) over barm) are investigated. It is revealed that the compound undergoes ferroelectric and ferroelastic structural phase transitions at temperatures of 297 and 205 K, respectively. The mПоказать полностьюechanism 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'MO3F3 (A,A' = NH4, K; M = Mo, W).

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Издание

Журнал: PHYSICS OF THE SOLID STATE

Выпуск журнала: Vol. 50, Is. 3

Номера страниц: 515-524

ISSN журнала: 10637834

Место издания: NEW YORK

Издатель: MAIK NAUKA/INTERPERIODICA/SPRINGER

Авторы

  • Flerov I.N. (Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia)
  • Fokina V.D. (Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia)
  • Bovina A.F. (Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia)
  • Bogdanov E.V. (Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia)
  • Molokeev M.S. (Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia)
  • Kocharova A.G. (Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia)
  • Pogorel'tsev E.I. (Siberian Fed Univ, Polytech Inst, Krasnoyarsk 660074, Russia)
  • Laptash N.M. (Russian Acad Sci, Inst Chem, Far E Div, Vladivostok 690022, Russia)

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