Structural and spectroscopic studies of Ba2Y1−δUO6+x
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A combination of S-XRD and NPD demonstrate the structure of Ba2Y0.879UO6+x to be monoclinic in space group I2/m. That the U is hexavalent is evident from the U L2-edge XANES measurements. This appears to be a rare example of a double perovskite containing vacancies at the octahedral B-sites and interstitial oxygen defects, which combine to stabilise hexavalent U and appears to be a consequence of the preparation of the sample in air. The Y vacancies, coupled with anion disorder, results in a distortion of the BO6 octahedra. © 2016 Elsevier B. V.
Perovskite, Anions, Uranium oxides, Defects, Crystal structure, Diffraction
Reynolds, E., Kennedy, B. J., Avdeev, M., Thorogood, G. J., Zhang, Z., & Brand, H. E. A. (2016). Structural and spectroscopic studies of Ba 2 Y 1− δ UO 6+ x. Journal of Solid State Chemistry, 243, 8-11. doi:10.1016/j.jssc.2016.07.007