Abstract
Processes of molecular relaxation in Li2SO4, Na2SO4, and K2SO4 sulfates; Li2CO3, Na2CO3, and K2CO3 carbonates; NaClO4 and KClO4 perchlorates; and Ca(NO3)2, Sr(NO3)2, and Ba(NO3)2 nitrates have been investigated by Raman spectroscopy. It is established that the first-order phase transitions in these systems have a stretched character (structural phase transitions in sulfates, carbonates, and perchlorates and crystal–melt phase transitions in nitrates). The existence of a pretransition region is found in all crystals under investigation.
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Aliev, A.R., Akhmedov, I.R., Kakagasanov, M.G. et al. Pretransition Phenomena Near First-Order Phase Transitions in Ion-Molecular Crystals. Phys. Solid State 62, 998–1010 (2020). https://doi.org/10.1134/S1063783420060037
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DOI: https://doi.org/10.1134/S1063783420060037