Cation antisite disorder in uranium-doped gadolinium zirconate pyrochlores

被引：40
|
作者：
Gregg, Daniel J. [1 ]
Zhang, Zhaoming [1 ]
Thorogood, Gordon J. [1 ]
Kennedy, Brendan J. [2 ]
Kimpton, Justin A. [3 ]
Griffiths, Grant J. [1 ]
Guagliardo, Paul R. [4 ]
Lumpkin, Gregory R. [1 ]
Vance, Eric R. [1 ]
机构：
[1] Australian Nucl Sci & Technol Org, Inst Mat Engn, Kirrawee Dc, NSW 2232, Australia
[2] Univ Sydney, Sch Chem, Sydney, NSW 2006, Australia
[3] Australian Synchrotron, Clayton, Vic 3168, Australia
[4] Univ Western Australia, Sch Phys, Ctr Antimatter Matter Studies, Crawley, WA 6009, Australia
来源：
JOURNAL OF NUCLEAR MATERIALS | 2014年 / 452卷 / 1-3期
基金：
澳大利亚研究理事会;
关键词：
CRYSTAL-CHEMISTRY; SPECTROSCOPY; A(2)B(2)O(7); DIFFRACTION; FLUORITE; BEAMLINE; GD2ZR2O7;
D O I：
10.1016/j.jnucmat.2014.05.021
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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. (C) 2014 Elsevier B. V. All rights reserved.
引用
收藏
页码：474 / 478
页数：5
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