Abstract
AbstractIsothermal 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 H2O. 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.
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