Abstract
Raman scattering spectra of Rb2KInF6 and Rb2KScF6 crystals have been studied under hydrostatic pressure up to 5.3 GPa at room temperature. Results are interpreted within semiempirical simulations of the lattice dynamics. Observed phase transitions both in Rb2KInF6 and Rb2KScF6 crystals are associated with condensation of soft F1g phonon mode. High-pressure phases for both crystals are supposed to be of C2/m space group.
Acknowledgments
This work has been financially supported by grants: Russian Foundation for Basic Research (project nos. 11-02-98002-r_sibir’ and 09-02-00062), the Siberian Branch of the Russian Academy of Sciences (integration project no.101), and the Council on Grants from the President of the Russian Federation (grant no. HSh-4645.2010.2).