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X‐ray diffraction investigations of CaF 2 at high pressure
Author(s) -
Gerward L.,
Olsen J. S.,
Steenstrup S.,
Malinowski M.,
Åsbrink S.,
Waskowska A.
Publication year - 1992
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889892004096
Subject(s) - orthorhombic crystal system , diffraction , synchrotron radiation , bulk modulus , phase transition , x ray crystallography , materials science , crystallography , powder diffraction , x ray , synchrotron , phase (matter) , high pressure , analytical chemistry (journal) , chemistry , crystal structure , condensed matter physics , thermodynamics , optics , composite material , physics , organic chemistry , chromatography
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.