Polarized Raman spectra of Gd<sub>2</sub>(MoO<sub>4</sub>)<sub>3</sub> in its orthorhombic structure - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Raman Spectroscopy Année : 2006

Polarized Raman spectra of Gd2(MoO4)3 in its orthorhombic structure

Résumé

Polarized Raman spectra of a single crystal of gadolinium molybdate, Gd2(MoO4)3 were obtained between 400 and 80 K. Tentative assignments of high-wavenumber bands of symmetric and antisymmetric MoO4 stretching modes to the three types of tetrahedra present in the ferroelectric phase described by the C2v8 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.

Domaines

Matériaux

Dates et versions

hal-00386402 , version 1 (21-05-2009)

Identifiants

Citer

Guy Lucazeau, Denis Machon. Polarized Raman spectra of Gd2(MoO4)3 in its orthorhombic structure. Journal of Raman Spectroscopy, 2006, 37 (1-3), pp. 189-201. ⟨10.1002/jrs.1456⟩. ⟨hal-00386402⟩
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