1992/10/01 by L. Gerward, J. Staun Olsen, J. S. Olsen +6 · 3 citations
Chemistry · Materials Science · #Inorganic Fluorides and Related Compounds #Luminescence Properties of Advanced Materials #Crystallography and molecular interactions
paper · doi:10.1107/s0021889892004096
Synchrotron-radiation X-ray diffraction studies of CaF 2 at high pressures have been performed on a powder sample up to 45 GPa and on a single-crystal sample up to 9.4 GPa. The bulk modulus of the low-pressure phase was determined to be B 0 = 87 (5) GPa. A phase transition was observed at about 9.5 GPa. The transition is accompanied by a volume contraction of 11%. The high-pressure phase is orthorhombic PbCl 2 type (space group Pbnm ). The sample only partially reverts to the low-pressure phase upon release of pressure.