Tang, LY (reprint author), Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China.
The high pressure diffraction study of SrF2 was performed using synchrotron radiation energy dispersive X-rays diffraction (EDXD). Liquid Ar was used as pressure transmitting medium in the experiment in order to produce hydrostatic pressure. The highest pressure was up to 44.2GPa. A phase transition of SrF2, from cubic to orthorhombic, occurred around 11.2GPa. By fitting the pressure-volume data, the bulk modulus of the cubic phase of SrF2 is 70.0(5.0)GPa, and the bulk modulus of the orthorhombic of SrF2 is 198.3(15.2)GPa. SrF2 was returned to the cubic phase by decreasing pressure.