✍ Scribed by A.V. Soldatov; D. Lamoen; M.J. Konstantinović; S. Van den Berghe; A.C. Scheinost; M. Verwerft
No coin nor oath required. For personal study only.
We investigated the local atomic and electronic structures of two related systematic sets of ternary uranium oxides, NaUO 3 -KUO 3 -RbUO 3 and BaUO 3 -Ba 2 U 2 O 7 -BaUO 4 , 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 U 5+ 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 U 5+ 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.
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