期刊
JOURNAL OF SOLID STATE CHEMISTRY
卷 180, 期 1, 页码 54-61出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2006.08.038
关键词
X-ray absorption fine structure; local and electronic structure; uranium oxides
We investigated the local atomic and electronic structures of two related systematic sets of ternary uranium oxides, NaUO3-KUO3-RbUO3 and BaUO3-Ba2U2O7-BaUO4, by measuring the X-ray absorption near edge structure (XANES). The results are compared with calculations based on a self-consistent real space full multiple scattering analysis. We found a very good agreement between measured and calculated spectra, which indicates that the uranium ions are in a pure U5+. oxidation state in these compounds. The low energy shoulder observed in the U L-3 edge XANES is an intrinsic feature of the uranium unoccupied 6d electronic states of the U5+ ions within the studied materials. Specific double shoulder features in the higher energy range of the U L-3 edge XANES can be interpreted as indicative of the pure cubic perovskite structure. (c) 2006 Elsevier Inc. All rights reserved.
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