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This article is cited in 1 scientific paper (total in 1 paper)
Thermal properties
Thermodynamic properties of vanadium oxypentafluoride (IV), (NH$_{4}$)$_{3}$VOF$_{5}$
E. V. Bogdanovab, E. I. Pogoreltsevac, A. V. Kartasheva, M. V. Gorevac, M. S. Molokeevac, S. V. Melnikovaa, I. N. Flerovac, N. M. Laptashd a L. V. Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk
b Krasnoyarsk State Agricultural University
c Institute of Engineering Physics and Radioelectronics, Siberian Federal University, Krasnoyarsk
d Institute of Chemistry, Far East Branch of the Russian Academy of Sciences, Vladivostok
Abstract:
The (NH$_{4}$)$_{3}$VOF$_{5}$ 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 (NH$_{4}$)$_{3}$VOF$_{5}$ crystals. The $T$ – $p$ phase diagram shows the temperature limits of stability of the crystalline phases implemented in (NH$_{4}$)$_{3}$VOF$_{5}$. 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 (NH$_{4}$)$_{3}$VOF$_{5}$ crystal makes it possible to distinguish the physical properties of oxyfluorides containing vanadium of different valences (IV and V).
Keywords:
oxyfluorides, phase transitions, specific heat, birefringence, thermal expansion, pressure susceptibility.
Received: 22.01.2020 Revised: 30.01.2020 Accepted: 30.01.2020
Citation:
E. V. Bogdanov, E. I. Pogoreltsev, A. V. Kartashev, M. V. Gorev, M. S. Molokeev, S. V. Melnikova, I. N. Flerov, N. M. Laptash, “Thermodynamic properties of vanadium oxypentafluoride (IV), (NH$_{4}$)$_{3}$VOF$_{5}$”, Fizika Tverdogo Tela, 62:7 (2020), 1123–1131; Phys. Solid State, 62:7 (2020), 1271–1279
Linking options:
https://www.mathnet.ru/eng/ftt8385 https://www.mathnet.ru/eng/ftt/v62/i7/p1123
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