Heat capacity, entropy, dielectric properties and T-p phase diagram of (NH4)(3)TiF7

Описание

Тип публикации: статья из журнала

Год издания: 2014

Идентификатор DOI: 10.1016/j.jfluchem.2014.10.016

Ключевые слова: Cubic fluorides, Phase transitions, Dielectric, Phase diagram, Calorimetry, Calorimetry, Cubic fluorides, Dielectric, Phase diagram, Phase transitions

Аннотация: Successive phase transitions G1 --> G2 --> G3 in the double salt (NH4)(3)TiF7 have been studied by detailed calorimetric, DTA under hydrostatic pressure and dielectric measurements. Rather large entropy jumps at phase transition points were found to be followed by large additional contributions associated with the temperature depenПоказать полностьюdence of the excess heat capacity. The permittivity behaviour and the tangent of the dielectric losses proved the nonferroelectric nature of both transformations. Two triple-points were found on the temperature-pressure phase diagram, suggesting the existence of a hypothetical parent G0 = Pm-3m cubic phase. A direct transformation between high (G0) and low (G3) temperature cubic phases takes place at p > 0.41 GPa with a baric coefficient dT(G0) --> (G3)/dp = -40 K/GPa. (C) 2014 Elsevier B.V. All rights reserved.

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Издание

Журнал: JOURNAL OF FLUORINE CHEMISTRY

Выпуск журнала: Vol. 168

Номера страниц: 247-250

ISSN журнала: 00221139

Место издания: LAUSANNE

Издатель: ELSEVIER SCIENCE SA

Авторы

  • Pogoreltsev E.I. (Siberian Federal University)
  • Flerov I.N. (Siberian Federal University)
  • Kartashev A.V. (L.V. Kirensky Institute of Physics, Siberian Department of RAS)
  • Bogdanov E.V. (Krasnoyarsk State Agrarian University)
  • Laptash N.M. (Institute of Chemistry, Far Eastern Department of RAS)

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