Local structure and oxidation state of uranium in some ternary oxides: X-ray absorption analysis

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Abstract

We investigated the local atomic and electronic structures of two related systematic sets of ternary uranium oxid,es, 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 L3 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 L3 edge XANES can be interpreted as indicative of the pure cubic perovskite structure.

Details

Original languageEnglish
Pages (from-to)54-61
JournalJournal of Solid State Chemistry
Volume180
Issue number1
DOIs
Publication statusPublished - Jan 2007

Keywords

  • X-ray absorption fine structure, Local and electronic structure, Uranium oxides

ID: 128503