Ferroelastic phase transitions in (NH4)(2)TaF7

Описание

Тип публикации: статья из журнала

Год издания: 2013

Идентификатор DOI: 10.1134/S1063783413030232

Аннотация: The heat capacity, unit cell parameters, permittivity, optical properties, and thermal expansion of the (NH4)(2)TaF7 compound with a seven-coordinated anion polyhedron have been measured. It has been found that the compound undergoes two successive phase transitions with the symmetry change: tetragonal -> (T (1) = 174 K) orthorhombПоказать полностьюic -> (T (2) = 156 K) tetragonal. The ferroelastic nature of structural transformations has been established, and their entropy and susceptibility to hydrostatic pressure have been determined.

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Издание

Журнал: PHYSICS OF THE SOLID STATE

Выпуск журнала: Vol. 55, Is. 3

Номера страниц: 611-618

ISSN журнала: 10637834

Место издания: NEW YORK

Издатель: MAIK NAUKA/INTERPERIODICA/SPRINGER

Авторы

  • Pogorel'tsev E.I. (Kirensky Institute of Physics,Siberian Branch of the Russian Academy of Sciences)
  • Mel'nikova S.V. (Kirensky Institute of Physics,Siberian Branch of the Russian Academy of Sciences)
  • Kartashev A.V. (Krasnoyarsk State Pedagogical University named after V.P. Astafyev)
  • Molokeev M.S. (Kirensky Institute of Physics,Siberian Branch of the Russian Academy of Sciences)
  • Gorev M.V. (Institute of Engineering Physics and Radio Electronics,Siberian Federal University)
  • Flerov I.N. (Institute of Engineering Physics and Radio Electronics,Siberian Federal University)
  • Laptash N.M. (Institute of Chemistry,Far-Eastern Branch of the Russian Academy of Sciences)

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