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Thermochemical and Raman spectroscopy studies reveal dehydration phases in chabazite, suggesting structural changes.
Chabazite dehydration was studied by means of thermochemistry and Raman spectroscopy. A method is suggested to determine heat capacity for partially dehydrated chabazite. At certain H2O contents dehydration stages and two drastic changes in thermodynamic characteristics are revealed. Raman spectroscopy revealed three phases following one another during dehydration. The results of thermochemical studies were compared with those of Raman spectroscopy. A phase transition took place with less than 3.8 mole H2O per unit cell (or 2H2O molecules per each Ca2+ + Na+ cation) leading to a more rigid structure. Phase transitions of that kind are typical of open nonequilibrium systems.
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Valueva et al. (1992) studied this question.
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