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Temperature‐dependent Raman study of H‐bonds and possible phase‐transition in LiHCOO·H 2 O
Author(s) -
Galzerani José Claudio,
Srivastava R.,
Katiyar R. S.,
Porto S. P. S.
Publication year - 1977
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.1250060405
Subject(s) - raman spectroscopy , hydrogen bond , crystal (programming language) , crystallography , phase transition , atmospheric temperature range , ferroelectricity , phase (matter) , molecule , molecular vibration , chemistry , phonon , crystal structure , lithium (medication) , materials science , nuclear magnetic resonance , condensed matter physics , optics , thermodynamics , physics , medicine , computer science , dielectric , programming language , optoelectronics , organic chemistry , endocrinology
Polarized Raman spectra of single crystals of lithium formate monohydrate (LiHCOO·H 2 O) have been measured from 4.2 K to 320 K. In the high‐frequency region, the observed modes have been assigned and the water molecule vibrations identified. The crystallographic distances between the two oxygens involved in the two hydrogen bonds have been obtained from the frequencies of the stretching OH vibrations, and the corresponding O…O vibration frequencies have been predicted and identified in the low‐frequency region. Although the crystal is thought to be potentially ferroelectric, we have observed no evidence of any structural change or presence of a ‘soft’ phonon in the crystal in the temperature range studied. Our measurements in various configurations do not indicate the presence of any LOTO splittings or any hydrogen disorder in the crystal.