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XANES Determination of Chromium Oxidation States in Glasses: Comparison With Optical Absorption Spectroscopy
Author(s) -
Villain Olivier,
Calas Georges,
Gaioisy Laurence,
Cormier Laurent,
Hazemann JeanLouis
Publication year - 2007
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2007.01905.x
Subject(s) - xanes , molar absorptivity , absorption (acoustics) , chromium , spectroscopy , analytical chemistry (journal) , oxidation state , absorption spectroscopy , materials science , attenuation coefficient , absorption edge , extended x ray absorption fine structure , chemistry , optics , metallurgy , metal , environmental chemistry , physics , optoelectronics , quantum mechanics , band gap , composite material
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.