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Raman spectra of a LiN(H x D 1‐x ) 4 SO 4 mixed crystal
Author(s) -
Torgashev V. I.,
Yuzyuk Yu. I.,
Smutný F.,
Polomska M.
Publication year - 1986
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221350109
Subject(s) - raman spectroscopy , crystal (programming language) , spectral line , deuterium , phase transition , phase (matter) , phenomenological model , lithium (medication) , crystal structure , materials science , crystallography , chemistry , analytical chemistry (journal) , condensed matter physics , physics , atomic physics , optics , medicine , organic chemistry , endocrinology , computer science , programming language , chromatography , astronomy
Raman spectra of a deuterated lithium ammonium sulphate single crystal are studied at 77 to 493 K. The results show that the I‐II‐III phase transitions are bonded essentially with the dynamics of Li‐SO 4 framework; the NH 4 ‐spectra are of a diffusive character so that no clear‐cut conclusions can be drawn about the role of the NH 4 ‐sublattice in these phase transitions. The spectra corroborate the necessity of using several order parameters in the phenomenological description of the phase transitions in this crystal.