Thermodynamic Properties of Vanadium Oxypentafluoride (IV) (NH4)3VOF5
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URI (для ссылок/цитирований):
https://link.springer.com/article/10.1134%2FS1063783420070057https://elib.sfu-kras.ru/handle/2311/143209
Дата:
2020-07Журнал:
Physics of the Solid StateКвартиль журнала в Scopus:
Q3Квартиль журнала в Web of Science:
Q4Библиографическое описание:
Bogdanov, E. V. Thermodynamic Properties of Vanadium Oxypentafluoride (IV) (NH4)3VOF5 [Текст] / E. V. Bogdanov, E. I. Pogoreltsev, A. V. Kartashev, M. V. Gorev, M. S. Molokeev, S. V. Mel’Nikova, I. N. Flerov, N. M. Laptash // Physics of the Solid State. — 2020. — Т. 62 (№ 7). — С. 1271-1279Текст статьи не публикуется в открытом доступе в соответствии с политикой журнала.
Аннотация:
The (NH4)3VOF5 crystals have been synthesized and their homogeneity and single-phase structure has been established by the X-ray diffraction, energy dispersive spectroscopy, and X-ray photoelectron spectroscopy studies. The investigations of the temperature dependences of specific heat, entropy, strain, and pressure susceptibility show the occurrence of three phase transitions caused by the structural transformations in the (NH4)3VOF5 crystals. The T-p phase diagram shows the temperature limits of stability of the crystalline phases implemented in (NH4)3VOF5. The optical and dielectric studies disclose the ferroelastic nature of the phase transitions. An analysis of the experimental data together with the data on the isostructural (NH4)3VO2F4 crystal makes it possible to distinguish the physical properties of oxyfluorides containing vanadium of different valences (IV and V).