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Infrared Spectrum of Deuterated Betaine Phosphite
Author(s) -
Banys J.,
Kamba S.,
Klöpperpieper A.,
Völkel G.
Publication year - 2002
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 - 10.1002/1521-3951(200206)231:2<581::aid-pssb581>3.0.co;2-f
Subject(s) - betaine , phonon , spectral line , deuterium , soft modes , polar , condensed matter physics , phase transition , protonation , chemistry , infrared spectroscopy , phase (matter) , materials science , nuclear magnetic resonance , ferroelectricity , physics , atomic physics , dielectric , ion , organic chemistry , quantum mechanics , optoelectronics
Far‐infrared spectra of deuterated betaine phosphite were investigated in the frequency range from 20 to 650 cm —1 at temperatures between 10 and 300 K. Most of the observed polar phonon modes exhibit pronounced increase of damping on heating to the ferroelectric phase transition at T c2 = 298 K. The phonon at 568 cm —1 , which is responsible for anomalous spin–lattice relaxation observed in EPR experiment, shows anomalous increase of damping near T c2 . Anomalous damping of the mode near 250 cm —1 is connected with the antiferrodistortive phase transition at T c1 = 355 K. Soft relaxational mode is not resolved in our spectra because its frequency lies below our frequency limit. The comparison of our spectra with the spectra of protonated betaine phosphite revealed no frequency shifts of phonon modes, verifying the missing influence of deuteration on external vibration of betaine and phosphite groups.