Structural and spectroscopic studies of Ba2Y1−δUO6+x

Reynolds, EM; Kennedy, BJ; Avdeev, M; Thorogood, GJ; Zhang, Z; Brand, HEA

Structural and spectroscopic studies of Ba2Y1−δUO6+x

Date

2016-11-01

Authors

Reynolds, EM

Kennedy, BJ

Avdeev, M

Thorogood, GJ

Zhang, Z

Brand, HEA

Publisher

Elsevier B.V.

Abstract

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.

Keywords

Perovskite, Anions, Uranium oxides, Defects, Crystal structure, Diffraction

Citation

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