This article is cited in 7 papers

Proceedings of the XIX All-Russian Conference on Physics of Ferroelectrics (VKS-XIX) (Moscow, Russia, June 19-23, 2011

A Raman study of hydrostatic pressure induced phase transitions in Rb$_2$KInF$_6$ crystals

A. N. Vtyurin^a, A. S. Krylov^a, S. V. Goryainov^b, S. N. Krylova^a, A. S. Oreshonkov^a, V. N. Voronov<sup>a

a</sup> L. V. Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk
^b Institute of Mineralogy and Petrology, Siberian Branch RAS, Novosibirsk

Abstract: The Raman spectra of the elpasolite (Rb$_2$KInF$_6$) crystal have been studied in the pressure range from 0 to 5.3 GPa at a temperature of 295 K. A phase transition at a pressure of approximately 0.9 GPa has been found. An analysis of the variations in the spectral parameters has led to the conclusion that the phase transition to a distorted phase is accompanied by the doubling of the volume of the primitive cell of the initial cubic phase. Numerical calculations of the lattice dynamics in the Rb$_2$KInF$_6$ crystal have been performed. The numerical simulation has established that the phase transition at a pressure of 0.9 GPa is associated with condensation of the $F_{lg}$ mode. A probable high-pressure phase is the phase with space group $C2/m$.

 English version: Physics of the Solid State, 2012, 54:5, 934–936

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