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Kinetics of IV -> III polymorphic transformation in Rb1-xCsxNO3 (x=0.025, 0.05, 0.1) single crystals
Russian version
DOI: 10.21883/SC.2022.05.53422.9796
Haziyeva A. F. 1, Nasirov V. I.1,2, Aliyev Y. I. 2, Jabarov S. H.2,3
1Institute of Physics, National Academy of Sciences of Azerbaijan, Baku, Azerbaijan
2Azerbaijan State Pedagogical University, Baku, Azerbaijan
3Azerbaijan State University of Economics (UNEC), Baku, Azerbaijan
Email: sakin@jinr.ru
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Optical microscopy was used to measure the growth rate of III-modification crystals as a function of temperature during the IV -> III transformation in Rb1-xCsxNO3 (x=0.025, 0.05, 0.1) single crystals. It is shown that the growth rate of III-modification crystals depending on temperature during the IV -> III transformation is described by the empirical formula: vIV->III=(-0.486Delta T+0.592Delta T2- 0.0015Delta T3)·10-2 cm/s, vIV->III=(-0.49Delta T+0.563Delta T2-0.0018Delta T3)·10-2 cm/s, vIV->III=(-0.437Delta T+0.484Delta T2-0.0014Delta T3) ·10-2 cm/s where Delta T=Ttr+T0. The activation energy of the process IV -> III transformation was calculated, which is equal to E=85.5 kJ/mol, E=82.8 kJ/mol, E=84.8 kJ/mol. Keywords: Crystals, polymorphic transformations, activation energy.
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