Тип публикации: статья из журнала
Год издания: 2020
Идентификатор DOI: 10.1016/j.jfluchem.2020.109523
Ключевые слова: Entropy, Fluorides, Heat capacity, High pressure, Phase transition, Thermal expansion
Аннотация: Heat capacity, thermal expansion, and sensitivity to the hydrostatic pressure of (NH4)2KZrF7 elpasolite are studied in a wide temperature range. The changes in deformation and entropy during successive phase transitions are determined: Δ(ΔV/V) = 3·10−4; ΔS = 8 J/mol K The temperatures and entropies of phase transitions turned out tПоказать полностьюo be slightly sensitive to pressure changes. An analysis of the entropy of phase transformations was performed in the framework of the model of the cubic phase structure Fm-3 m. In the low temperature phase, an anomalous behavior of thermodynamic properties, which is not characteristic of phase transitions, was observed, accompanied by a significant change in the crystal lattice entropy. © 2020 Elsevier B.V.
Журнал: Journal of Fluorine Chemistry
Выпуск журнала: Vol. 235
Номера страниц: 109523
ISSN журнала: 00221139
Издатель: Elsevier B.V.