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Pressure dependence of the Raman spectra of LiNbO 3 and LiTaO 3
Author(s) -
MendesFilho J.,
Lemos V.,
Cerdelra F.
Publication year - 1984
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.1250150602
Subject(s) - raman spectroscopy , soft modes , ferroelectricity , phase transition , bar (unit) , dielectric , phase (matter) , spectral line , transverse plane , condensed matter physics , materials science , chemistry , optics , molecular physics , optoelectronics , physics , structural engineering , engineering , meteorology , organic chemistry , astronomy
The pressure dependence of the room‐temperature Raman spectrum of LiNbO 3 and LiTaO 3 in the range 1 bar‐80 kbar is reported. The studies were confined to the transverse optical modes, since these are the modes which could be involved in the ferroelectric‐paraelectric phase transition occurring in both materials at high temperatures. All mode frequencies increase linearly as the pressure increases and no distinctive behaviour is observed in the lowest frequency A 1 (TO) modes, identified by some workers as soft modes.