Phase Transitions in the K0.94Cs0.06NO3 Single Crystal

• Published in: Crystallography reports Vol. 67; no. 6; pp. 1013 - 1017
• Main Authors: Nasirov, V. I., Bairamov, R. B., Nasirov, E. V.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01.12.2022; Springer Nature B.V
• Subjects: Aqueous solutions; Crystal Growth; Crystallization; Crystallography and Scattering Methods; Phase equilibria; Phase transitions; Physics; Physics and Astronomy; Single crystals; Transformation temperature
• ISSN: 1063-7745; 1562-689X
• DOI: 10.1134/S1063774522060189

K 0.945 Cs 0.06 NO 3 single crystals have been grown by isothermal crystallization from an aqueous solution. The growth morphology of the crystals of phases III and II (rhombohedral for III and orthorhombic for II) at the II ↔ III phase transitions is investigated, and the growth rate of the III-phase crystal at the II → III transitions is measured. It is found that the structural transformations in the crystal under study are enantiotropic, and the equilibrium temperature between phases II and III is Т 0 = 457 ± 1 К. An empirical relationship between the growth rate and temperature is established in the form ϑ = 0.6374Δ T + 0.9212Δ T   2 – 0.01668Δ T   3 , where Δ Т = Т tr – Т 0 , Т tr is the transformation temperature, and Т 0 is the phase equilibrium temperature.