Pretransition Phenomena Near First-Order Phase Transitions in Ion-Molecular Crystals

Processes of molecular relaxation in Li 2 SO 4 , Na 2 SO 4 , and K 2 SO 4 sulfates; Li 2 CO 3 , Na 2 CO 3 , and K 2 CO 3 carbonates; NaClO 4 and KClO 4 perchlorates; and Ca(NO 3 ) 2 , Sr(NO 3 ) 2 , and Ba(NO 3 ) 2 nitrates have been investigated by Raman spectroscopy. It is established that the firs...

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Veröffentlicht in:	Physics of the solid state 2020-06, Vol.62 (6), p.998-1010
Hauptverfasser:	Aliev, A. R., Akhmedov, I. R., Kakagasanov, M. G., Aliev, Z. A.
Format:	Artikel
Sprache:	eng
Schlagworte:	Alloys Carbonates Chlorates Crystal structure Molecular relaxation Nitrates Perchlorates Phase Transitions Physical Sciences Physics Physics and Astronomy Physics, Condensed Matter Potassium carbonate Potassium perchlorates Potassium sulfate Raman spectroscopy Science & Technology Sodium carbonate Sodium perchlorate Sodium sulfate Solid State Physics Sulfates
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Zusammenfassung:	Processes of molecular relaxation in Li 2 SO 4 , Na 2 SO 4 , and K 2 SO 4 sulfates; Li 2 CO 3 , Na 2 CO 3 , and K 2 CO 3 carbonates; NaClO 4 and KClO 4 perchlorates; and Ca(NO 3 ) 2 , Sr(NO 3 ) 2 , and Ba(NO 3 ) 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.
ISSN:	1063-7834 1090-6460
DOI:	10.1134/S1063783420060037