1. Cation antisite disorder in uranium-doped gadolinium zirconate pyrochlores.
- Author
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Gregg, Daniel J., Zhang, Zhaoming, Thorogood, Gordon J., Kennedy, Brendan J., Kimpton, Justin A., Griffiths, Grant J., Guagliardo, Paul R., Lumpkin, Gregory R., and Vance, Eric R.
- Subjects
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ANTISITE defects , *URANIUM , *GADOLINIUM zirconate , *PYROCHLORE , *DOPING agents (Chemistry) , *X-ray powder diffraction - Abstract
The incorporation of uranium into gadolinium zirconate (Gd2Zr2O7) 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 Gd2Zr2O7 and U-doped Gd2Zr2O7 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 Gd2Zr2O7 pyrochlore. [ABSTRACT FROM AUTHOR]
- Published
- 2014
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