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Raman spectra of vanadates MV2O6 (M= Mn, Co, Ni, Zn) crystallized in the non-usual columbite-type structure

Abstract : We report the first Raman spectra for the vanadates with chemical formula MV 2 O 6 (M = Mn, Co, Ni, Zn) crystallized in a columbite-type structure (Pbcn space group). The columbite-type structure, which is quite unusual for the compounds MV 2 O 6 , was obtained by synthesis at high temperature and pressure from precursor powder samples in either P1 or C2/m structures. The cell parameters, interatomic distances, and distortion indexes of the octahedra in the Pbcn structure, were obtained from the Rietveld refinement of powder X-ray diffraction patterns measured at room temperature for each sample. The Raman modes were obtained from high quality spectra recorded in the range of wavenumbers between 50 and 1170 cm − 1 ; these were assigned by comparison with the known spectra of the isostructural niobates MNb 2 O 6. Common sequences of peaks can be identified in the Raman spectra of all the studied samples, but the position of those peaks in wavenumber ω does not follow the behavior that is expected from looking only at the interatomic distances between the atoms involved in the vibration. The influence of the electronegativity of the atoms M in the force constants of the V-O bonds is proven in the evolution of the A g Raman mode observed at the highest wavenumber.
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https://hal.archives-ouvertes.fr/hal-03189541
Contributeur : Pierre Bouvier <>
Soumis le : mercredi 7 avril 2021 - 07:42:58
Dernière modification le : jeudi 8 avril 2021 - 03:35:14

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J.P. Pena, Pierre Bouvier, M. Hneda, C. Goujon, O. Isnard. Raman spectra of vanadates MV2O6 (M= Mn, Co, Ni, Zn) crystallized in the non-usual columbite-type structure. Journal of Physics and Chemistry of Solids, Elsevier, 2021, 154, pp.110034. ⟨10.1016/j.jpcs.2021.110034⟩. ⟨hal-03189541⟩

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