کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1329921 | 978934 | 2007 | 8 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Local structure and oxidation state of uranium in some ternary oxides: X-ray absorption analysis Local structure and oxidation state of uranium in some ternary oxides: X-ray absorption analysis](/preview/png/1329921.png)
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 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.
Comparison of the experimental U L3 edge XANES in BaUO3 and NaUO3 with the theoretical spectra.Figure optionsDownload as PowerPoint slide
Journal: Journal of Solid State Chemistry - Volume 180, Issue 1, January 2007, Pages 54–61