Anomalous behaviour of thermodynamic properties at successive phase transitions in (NH4)3GeF7
URI (для ссылок/цитирований):
https://www.sciencedirect.com/science/article/pii/S0022459617303705https://elib.sfu-kras.ru/handle/2311/111332
Автор:
Evgeniy V. Bogdanov
Andrey V. Kartashev
Evgeniy I. Pogoreltsev
Mikhail V. Gorev
Natalia M. Laptash
Igor N. Flerov
Коллективный автор:
Институт инженерной физики и радиоэлектроники
Кафедра теплофизики
Дата:
2017-12Журнал:
Journal of Solid State ChemistryКвартиль журнала в Scopus:
Q1Квартиль журнала в Web of Science:
Q2Библиографическое описание:
Evgeniy V. Bogdanov. Anomalous behaviour of thermodynamic properties at successive phase transitions in (NH4)3GeF7 [Текст] / Evgeniy V. Bogdanov, Andrey V. Kartashev, Evgeniy I. Pogoreltsev, Mikhail V. Gorev, Natalia M. Laptash, Igor N. Flerov // Journal of Solid State Chemistry. — 2017. — Т. 256. — С. 162-167Аннотация:
Heat capacity, thermal dilatation, susceptibility to hydrostatic pressure and dielectric properties associated with
succession of three phase transitions below room temperature in double fluoride salt (NH4)3GeF7 were studied.
A possible transformation into the parent Pm-3m cubic phase was not observed up to the decomposition of
compound. Nonferroelectric nature of structural distortions was confirmed. The DTA under pressure studies
revealed a high temperature stability of two phases: P4/mbm and Pbam. The entropies of the phase transitions
agree well with the model of structural distortions. Analysis of the thermal properties associated with the
individual phase transitions in the framework of thermodynamic equations has shown a high reliability of the
data obtained.