Thermal properties of (NH4)(2)MeF6 center dot NH4F (Me: Ti, Sn) crystals undergoing transformation between two cubic phases

Описание

Тип публикации: статья из журнала (материалы конференций, опубликованные в журналах)

Конференция: 8th International Seminar on Ferroelastic Physics (ISFP); Voronezh, RUSSIA; Voronezh, RUSSIA

Год издания: 2016

Идентификатор DOI: 10.1080/00150193.2016.1198659

Ключевые слова: Phase transitions, fluorides, heat capacity, entropy, phase diagram, entropy, fluorides, heat capacity, phase diagram, Phase transitions, Entropy, Fluorine compounds, Order disorder transitions, Phase transitions, Specific heat, Thermal expansion, Tin, Cubic phase, Cubic phasis, Excess entropy, entropy, fluorides, heat capacity, phase diagram, Phase transitions, Entropy, Fluorine compounds, Order disorder transitions, Phase transitions, Specific heat, Thermal expansion, Tin, Cubic phase, Cubic phasis, Excess entropy

Аннотация: The heat capacity, thermal expansion, and T-p phase diagrams of (NH4)(3)TiF7 and (NH4)(3)SnF7 were studied in wide temperature and pressure ranges. The total excess entropies at successive Pa-3 P4/mnc 4/m (Ti) and single Pa-3 Pm-3m (Sn) phase transitions are close to each other and characteristic for the order-disorder processes. TПоказать полностьюhe Pm-3m cubic phase and direct Pa-3 Pm-3m transformation were found at high pressure in (NH4)(3)TiF7. The different sign of baric coefficients for phase transition between two cubic phases in (NH4)(3)TiF7 and (NH4)(3)SnF7 was supposed due to nonlinear phase boundary with pressure in the latter fluoride.

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Издание

Журнал: FERROELECTRICS

Выпуск журнала: Vol. 501, Is. 1

Номера страниц: 20-25

ISSN журнала: 00150193

Место издания: ABINGDON

Издатель: TAYLOR & FRANCIS LTD

Авторы

  • Pogoreltsev E.I. (RAS, Siberian Dept, Kirensky Inst Phys, Krasnoyarsk, Russia; Siberian fed univ, Inst engn phys & radioelect, Krasnoyarsk, Russia)
  • Bogdanov E.V. (RAS, Siberian Dept, Kirensky Inst Phys, Krasnoyarsk, Russia; Krasnoyarsk State Agrarian Univ, Krasnoyarsk, Russia)
  • Kartashev A.V. (RAS, Siberian Dept, Kirensky Inst Phys, Krasnoyarsk, Russia)
  • Molokeev M.S. (RAS, Siberian Dept, Kirensky Inst Phys, Krasnoyarsk, Russia; Far Eastern State Transport Univ, Khabarovsk, Russia)
  • Flerov I.N. (RAS, Siberian Dept, Kirensky Inst Phys, Krasnoyarsk, Russia; Siberian fed univ, Inst engn phys & radioelect, Krasnoyarsk, Russia)
  • Laptash N.M. (RAS, Far Eastern Dept, Inst Chem, Vladivostok, Russia)

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