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XANES Determination of Chromium Oxidation States in Glasses: Comparison With Optical Absorption Spectroscopy

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The oxidation state of chromium in glasses melted in an air atmosphere with and without refining agents was investigated by Cr K-edge X-ray absorption near-edge structure (XANES) and optical absorption spectroscopy. A good agreement in the relative proportion of Cr(III) and Cr(VI) is obtained between both methods. We show that the chemical dependence of the absorption coefficient of Cr(III) is less important in XANES than in optical absorption spectroscopy. The comparison of optical absorption and XANES spectra of glasses melted under different conditions provides an indirect assessment of the molar extinction coefficient of Cr(VI) in glasses.

Document Type: Research Article


Affiliations: 1: Institut de Minéralogie et de Physique des Milieux Condensés, Université Pierre et Marie Curie, UMR CNRS 7590, Université Denis Diderot, Institut de Physique du Globe de Paris, 140 rue de Lourmel, 75015 Paris, France 2: Institut Néel, CNRS, Université Joseph Fourier, 25 avenue des Martyrs, BP 166, 38042 Grenoble cedex 9, France

Publication date: November 1, 2007

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