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Study of the temperature stability of chabasite
Author(s) -
Rykl D.,
Pechar F.,
Chalupský V.
Publication year - 1985
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.2170200419
Subject(s) - valence (chemistry) , isothermal process , diffraction , dehydration , atmospheric temperature range , infrared spectroscopy , chemistry , crystallography , thermal decomposition , infrared , crystal structure , differential thermal analysis , decomposition , x ray crystallography , powder diffraction , thermal stability , analytical chemistry (journal) , materials science , thermodynamics , optics , physics , biochemistry , organic chemistry , chromatography
Isothermal decomposition of chabasite was carried out at temperatures of 20, 180, 400, 600, 735, 850 and 1000 °C with the aid of differential thermal analysis. The decomposition products were identified by X‐ray powder diffraction and infrared absorption spectroscopy. It was found that the crystal structure of chabasite was stable in the whole range of temperatures. Dehydration takes place at a single stage. A change in lattice parameters, in intensity and splitting of X‐ray diffraction lines takes places with increasing temperature. Dehydration corresponds to the decrease in intensities of valence vibrations of OH, and the vanishing of librations and deformation vibrations of H 2 O. The residual water is heterolytically decomposed and forms structural OH groups in the large cavities of the mineral, which partly survive up to 1000 °C.