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Raman and far‐infrared spectra of weak ferroelectric cyclohexane‐1,1′‐diacetic acid
Author(s) -
Yuzyuk Yu. I.,
Farhi R.,
Kamba S.,
Petzelt J.,
Vanek P.,
Rabkin L. M.
Publication year - 1999
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/(sici)1097-4555(199907)30:7<599::aid-jrs426>3.0.co;2-t
Subject(s) - raman spectroscopy , ferroelectricity , cyclohexane , spectral line , phase transition , chemistry , dielectric , phase (matter) , infrared spectroscopy , relaxation (psychology) , far infrared , infrared , analytical chemistry (journal) , atmospheric temperature range , condensed matter physics , materials science , crystallography , optics , physics , organic chemistry , optoelectronics , thermodynamics , psychology , social psychology , astronomy
Polarized Raman spectra of the new weak ferroelectric crystal cyclohexane‐1,1′‐diacetic acid [C 6 H 10 (CH 2 COOH) 2 ] were studied in the temperature range 300–420 K and spectral range 10–3500 cm −1 . Wavenumbers of external modes were compared with the modes observed in far‐infrared transmission spectra. Temperature evolution of the spectra confirms the order–disorder character of the phase transition at T c = 397 K and C 2/ c symmetry of the paraelectric phase. Strong disorder in the paraelectric phase is reflected through the central (relaxation) modes observed in both A g and B g spectra above T c . These central modes exhibit non‐critical behaviour near T c . Copyright © 1999 John Wiley & Sons, Ltd.