Abstract
The polymorphic transformations in K0.945Ag0.055NO3 are studied by optical spectroscopy and X-ray diffraction. It is established that one structural transformation occurs in this crystal in the temperature range from room temperature to the melting point. The growth of new crystal modification growth is accompanied by the formation and growth of daughter modification nuclei inside the matrix crystal. The equilibrium temperature between modifications II and III (Т0 = 393 ± 1 K) and the unit-cell parameters for crystals of these modifications are determined. At room temperature, the orthorhombic modification parameters are a = 5.407 A, b = 9.156 A, and c = 6.410 A; sp. gr. Pnma. The parameters of high-temperature rhombohedral modification are a = 5.405 A and c = 9.712 A; sp. gr. $$R{\bar {3}}m$$. It is established using X-ray diffraction analysis that the II → III polymorphic transformation in K0.945Ag0.055NO3 is of the single crystal–single crystal type.
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