Тип публикации: статья из журнала (материалы конференций, опубликованные в журналах)
Конференция: 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, Fluorine compounds, Order disorder 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.
Журнал: FERROELECTRICS
Выпуск журнала: Vol. 501, Is. 1
Номера страниц: 20-25
ISSN журнала: 00150193
Место издания: ABINGDON
Издатель: TAYLOR & FRANCIS LTD