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Thorogood, G. J.
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article
Cation antisite disorder in uranium-doped gadolinium zirconate pyrochlores
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.