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This article is cited in 6 scientific papers (total in 6 papers)
Phase transitions
Thermal, optical, and dielectric properties of fluoride Rb$_{2}$TaF$_{7}$
E. I. Pogoreltsevab, S. V. Melnikovaa, A. V. Kartashevac, M. V. Gorevab, I. N. Flerovab, N. M. Laptashd a L. V. Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk
b Institute of Engineering Physics and Radioelectronics, Siberian Federal University, Krasnoyarsk
c Krasnoyarsk State Pedagogical University named after V. P. Astaf'ev
d Institute of Chemistry, Far East Branch of the Russian Academy of Sciences, Vladivostok
Abstract:
The thermal, optical, and dielectric properties of fluoride Rb$_{2}$TaF$_{7}$ were investigated. It was observed that the variation in chemical pressure in fluorides $A^{+}_{2}$TaF$_{7}$ caused by the cation substitution of rubidium for ammonium does not affect the ferroelastic nature of structural distortions, but leads to stabilization of the high- and low-temperature phases and enhancement of birefringence. The entropy of the phase transition $P$4/$nmm\leftrightarrow Cmma$ is typical of the shift transformations, which is consistent with a model of the initial and distorted phase structures. The anisotropy of chemical pressure causes the change of signs of the anomalous strain and baric coefficient $dT/dp$ of Rb$_{2}$TaF$_{7}$ as compared with the values for its ammonium analog.
Received: 26.09.2016 Revised: 19.10.2016
Citation:
E. I. Pogoreltsev, S. V. Melnikova, A. V. Kartashev, M. V. Gorev, I. N. Flerov, N. M. Laptash, “Thermal, optical, and dielectric properties of fluoride Rb$_{2}$TaF$_{7}$”, Fizika Tverdogo Tela, 59:5 (2017), 959–964; Phys. Solid State, 59:5 (2017), 986–991
Linking options:
https://www.mathnet.ru/eng/ftt9588 https://www.mathnet.ru/eng/ftt/v59/i5/p959
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