Determination of Valence States of Chromium in Calcium Chromates by Using X-ray Absorption Near-Edge Structure (XANES) Spectroscopy |
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| Authors: | Iztok Arcon Breda Mirtic Alojz Kodre |
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| Affiliation: | School of Environmental Sciences, pp 301, 5001 Nova Gorica, Slovenia and Institute Jõef Stefan, 1000 Ljubljana, Slovenia;Department of Geology, Faculty of Natural Sciences and Engineering, University of Ljubljana, 1000 Ljubljana, Slovenia;Department of Physics, Faculty of Mathematics and Physics, University of Ljubljana, 1000 Ljubljana, Slovenia and Institute Jõef Stefan, 1000 Ljubljana, Slovenia |
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| Abstract: | Calcium chromates with the empirical formulas Ca10Cr6−O25, Ca3Cr2O8, and Ca5Cr3O12, which form at temperatures >900°C at CaO:Cr2O3 molar ratios of 3 in an oxidation atmosphere have been synthesized in the pure state. X-ray absorption near-edge structure (XANES) spectroscopy has been used to determine the average valence state of chromium in the samples. The presence of unusual chromium valence states, 4+ and 5+, which was proposed via X-ray diffractometry studies, is strongly supported. |
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