By the method of high-temperature X-ray diffraction, the presence of a reversible polymorphic transformation of both synthesized stoichiometric leucite and precipitated as a result of crystallization of glasses was established. The established temperature limit of this transition for leucite, which is in the composition of glass-crystalline material, shifts to a region of lower temperatures in comparison with the modification transition of synthetic leucite. Il. 2, bibliography: 9 titles.
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