Pressure-induced phase transition inSrF2: A Raman study

Abstract

Measurements of Raman scattering under hydrostatic pressure in ${\mathrm{SrF}}_2$ show that the β→α phase transition, common to fluorite structures, occurs around 5.0 GPa at 300 K. Symmetry assignment of phonons in the α phase is based on a comparison to other fluorite crystals. Hysteresis phenomena are observed and discussed. Anharmonic processes are shown to be small but not negligible.