Open AccessПредпереходные явления в области фазовых переходов первого рода в ионно-молекулярных кристаллах
Author(s) -
А.Р. Алиев,
И.Р. Ахмедов,
М.Г. Какагасанов,
З.А. Алиев
Publication year - 2020
Publication title -
fizika tverdogo tela
Language(s) - English
Resource type - Journals
eISSN - 1726-7498
pISSN - 0367-3294
DOI - 10.21883/ftt.2020.06.49344.34m
Subject(s) - phase transition , raman spectroscopy , phase (matter) , chemistry , crystal (programming language) , relaxation (psychology) , inorganic chemistry , crystallography , materials science , thermodynamics , organic chemistry , psychology , social psychology , physics , computer science , optics , programming language
Raman spectroscopy was used to study the molecular relaxation processes in sulfates Li2SO4, Na2SO4, K2SO4, carbonates Li2CO3, Na2CO3, K2CO3, perchlorates NaClO4, KClO4 and nitrates Ca(NO3)2, Sr(NO3)2, Ba(NO3)2. It has been established that in the systems under study, phase transitions of the first kind are stretched in nature (diffuse phase transition): in sulfates, carbonates and perchlorates they are structural phase transitions, and in nitrates this is a crystal-melt phase transition. The existence of a pre-transition region was found in all the crystals studied.