Thermomechanical analysis, high-temperature radiography, and X-ray powder diffraction were used to determine how the temperatures of structural transformation into phase B and of destruction of the clinoptilolite structure depend on the amount of Ca in (Na,Ca)-substituted forms in zeolite-bearing tuffs from the Khonguru deposit (Yakutia). Thermal properties in the Ca-Na series change continuously. The parameters of transformation into phase B are in inverse proportion to those of the structure destruction.
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