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Polarized Raman spectra of Gd 2 (MoO 4 ) 3 in its orthorhombic structure
Author(s) -
Guy Lucazeau,
Denis Machon
Publication year - 2006
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.1456
Subject(s) - raman spectroscopy , orthorhombic crystal system , wavenumber , ferroelectricity , crystallography , chemistry , spectral line , molybdate , antiferroelectricity , crystal structure , space group , dielectric , materials science , x ray crystallography , physics , optics , inorganic chemistry , diffraction , optoelectronics , astronomy
Polarized Raman spectra of a single crystal of gadolinium molybdate, Gd 2 (MoO 4 ) 3 were obtained between 400 and 80 K. Tentative assignments of high‐wavenumber bands of symmetric and antisymmetric MoO 4 stretching modes to the three types of tetrahedra present in the ferroelectric phase described by the C 2 v 8 space group are made on the oriented gas model. A careful analysis of the low‐wavenumber spectra allowed identification of new bands compared to those in the literature. The evolution of wavenumbers in the investigated temperature range indicates that a small structural change takes place at about 200 K. Some modes soften when approaching the ferroelectric–paraelectric transition at 159 °C. Copyright © 2006 John Wiley & Sons, Ltd.
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