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Neutron and Synchrotron Radiation High Pressure Experiments on Aluminate Sodalite Sr 8 [Al 12 O 24 ](CrO 4 ) 2
Author(s) -
Melzer R.,
Depmeier W.,
Vogt T.,
Gering E.
Publication year - 1995
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170300608
Subject(s) - sodalite , superstructure , synchrotron radiation , neutron diffraction , materials science , desy , diamond anvil cell , bulk modulus , phase transition , powder diffraction , powder diffractometer , wüstite , x ray crystallography , crystallography , analytical chemistry (journal) , neutron , compressibility , orthorhombic crystal system , diffraction , ambient pressure , chemistry , thermodynamics , hematite , crystal structure , optics , nuclear physics , composite material , zeolite , metallurgy , physics , biochemistry , chromatography , catalysis
High pressure powder diffraction experiments were carried out on the aluminate sodalite Sr 8 [Al 12 O 24 ] · (CrO 4 ) 2 using a miniature clamped cell with neutron radiation at the ILL and a diamond anvil cell with synchrotron radiation at Hasylab/Desy. The results of both experiments agree well. Lattice parameters were determined up to a pressure of 7.2 GPa. The average linear compressibility amounts to 4.3 · 10 −3 GPa −1 , which corresponds to a linear bulk modulus of 233 GPa. The observation of superstructure reflections could be related to two new phase transitions. The first one occurs between 0.37 and 0.5 GPa, the second one at about 2.0 GPa. A final measurement at ambient pressure revealed the reversible character of the pressure induced phase transitions.