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Raman and far-infrared spectra of weak ferroelectric cyclohexane-1,1′-diacetic acid

✍ Scribed by Yu. I. Yuzyuk; R. Farhi; S. Kamba; J. Petzelt; P. Vanek; L. M. Rabkin

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
109 KB
Volume
30
Category
Article
ISSN
0377-0486

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✦ Synopsis

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 .

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