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

页码：474 / 478

页数：5

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