Study of structural defects in γ-MnO2 by Raman spectroscopy

Authors

  • C. Julien,

    Corresponding author
    1. Laboratoire des Milieux Désordonnés et Hétérogènes, UMR 7603, Université Pierre et Marie Curie, 4 place Jussieu, case 86, 75252 Paris cedex 05, France
    • Laboratoire des Milieux Désordonnés et Hétérogènes, UMR 7603, Université Pierre et Marie Curie, 4 place Jussieu, case 86, 75252 Paris cedex 05, France.
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  • M. Massot,

    1. Laboratoire de Physique des Milieux Condensés, UMR 7602, Université Pierre et Marie Curie, 4 place Jussieu, case 77, 75252 Paris cedex 05, France
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  • S. Rangan,

    1. Laboratoire des Milieux Désordonnés et Hétérogènes, UMR 7603, Université Pierre et Marie Curie, 4 place Jussieu, case 86, 75252 Paris cedex 05, France
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  • M. Lemal,

    1. Laboratoire des Milieux Désordonnés et Hétérogènes, UMR 7603, Université Pierre et Marie Curie, 4 place Jussieu, case 86, 75252 Paris cedex 05, France
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  • D. Guyomard

    1. Laboratoire de Chimie des Solides, UMR 6502, Institut des Matériaux Jean Rouxel, 2 rue de la Houssinière, BP 32229, 44322 Nantes cedex 3, France
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Abstract

The structural arrangement of γ-MnO2 is currently explained by a random intergrowth of pyrolusite layers in a ramsdellite matrix. The structures of a large variety of γ-MnO2 samples with various structural parameters Pr were studied by x-ray powder diffraction and Raman scattering spectroscopy. We show that elucidation of the quantitative determination of the structural disorder present in γ-MnO2 is accurate by Raman scattering spectroscopy. The Raman data for manganese dioxides with the γ-type structure are treated by a local environment model, which allows one to consider the relationship between the band wavenumber and the pyrolusite intergrowth that corresponds to the structural De Wolff defects. Copyright © 2002 John Wiley & Sons, Ltd.

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