Calorimetric, dilatometric and DTA under pressure studies of the phase transitions in elpasolite (NH4)2KZrF7
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URI (для ссылок/цитирований):
https://doi.org/10.1016/j.jfluchem.2020.109523https://elib.sfu-kras.ru/handle/2311/142597
Автор:
Горев, М. В.
Карташев, А. В.
Богданов, Е. В.
Флёров, И. Н.
Лапташ, Н. М.
Коллективный автор:
Институт инженерной физики и радиоэлектроники
Кафедра теплофизики
Дата:
2020-07Журнал:
Journal of Fluorine ChemistryКвартиль журнала в Scopus:
Q2Квартиль журнала в Web of Science:
Q2Библиографическое описание:
Горев, М. В. Calorimetric, dilatometric and DTA under pressure studies of the phase transitions in elpasolite (NH4)2KZrF7 [Текст] / М. В. Горев, А. В. Карташев, Е. В. Богданов, И. Н. Флёров, Н. М. Лапташ // Journal of Fluorine Chemistry. — 2020. — Т. 235.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 to 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 haracteristic of phase transitions, was observed, accompanied by a significant change in the crystal lattice entropy.