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Title: Cation antisite disorder in uranium-doped gadolinium zirconate pyrochlores
Authors: Gregg, DJ
Zhang, ZM
Thorogood, GJ
Kennedy, BJ
Kimpton, JA
Griffiths, GJ
Guagliardo, PR
Lumpkin, GR
Vance, ER
Keywords: Uranium
X-ray diffraction
Issue Date: 1-Sep-2014
Publisher: Elsevier
Citation: Gregg, D. J., Zhang, Z., Thorogood, G. J., Kennedy, B. J., Kimpton, J. A., Griffiths, G. J., Guagliaro, P. R. Lumpkin, G. R., & Vance, E. R. (2014). Cation antisite disorder in uranium-doped gadolinium zirconate pyrochlores. Journal of Nuclear Materials, 452(1–3), 474-478. doi:10.1016/j.jnucmat.2014.05.021
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. © 2014, Elsevier B.V.
Gov't Doc #: 6963
ISSN: 0022-3115
Appears in Collections:Journal Articles

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