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A Structural Study of Aluminate Sodalite Ca 8 [Al 12 O 24 ](CrO 4 ) 2 (CACr)
Author(s) -
Melzer R.,
Depmeier W.
Publication year - 1996
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.2170310409
Subject(s) - sodalite , rietveld refinement , differential thermal analysis , phase transition , x ray crystallography , aluminate , crystallography , neutron diffraction , powder diffraction , diffraction , atmospheric temperature range , materials science , crystal structure , phase (matter) , lattice (music) , synchrotron , chemistry , analytical chemistry (journal) , thermodynamics , zeolite , physics , metallurgy , optics , cement , biochemistry , organic chemistry , catalysis , chromatography , acoustics
The structure of the cubic high temperature phase of Ca 8 [Al 12 O 24 ] (CrO 4 ) 2 , CACr, has been determined at 700 K by Rietveld analysis of neutron powder diffraction data. The structure is discussed with respect of those of its homologues. The phase transitions of the title compound have been investigated by means of synchrotron x‐ray powder diffraction and differential thermo analysis. High precision lattice parameters have been determined in the temperature range between 350 and 750 K. Three phase transitions occurring at 610 K, 453 K, and 432 K could be verified. Observed anomalies in the lattice parameters versus temperature might indicate a yet unknown phase transition at about 555 K. This is supported by results of differential thermo analysis.