Cation antisite disorder in uranium-doped gadolinium zirconate pyrochlores

D.J. Gregg, Z. Zhang, G.J. Thorogood, B.J. Kennedy, J.A. Kimpton, G.J. Griffiths, Paul Guagliardo, G.R. Lumpkin, E.R. Vance

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28 Citations (Scopus)

Abstract

The incorporation of uranium into gadolinium zirconate (Gd 2Zr2O7) is investigated by synchrotron X-ray powder diffraction and X-ray absorption near-edge structure (XANES) spectroscopy. The results suggest that the uranium cation is largely located on the pyrochlore B-site instead of the targeted A-site. Cation disorder in Gd 2Zr2O7 and U-doped Gd2Zr 2O7 is investigated by positron annihilation lifetime spectroscopy (PALS) which demonstrates the absence of cation vacancies in these systems. This work provides direct evidence for cation antisite (A- and B-site mixing) disorder in U-doped and off-stoichiometric Gd2Zr 2O7 pyrochlore. © 2014 Elsevier B.V. All rights reserved.
Original languageEnglish
Pages (from-to)474-478
JournalJournal of Nuclear Materials
Volume452
Issue number1-3
Early online date17 May 2014
DOIs
Publication statusPublished - Sep 2014

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