Cation antisite disorder in uranium-doped gadolinium zirconate pyrochlores

D.J. Gregg; Z. Zhang; G.J. Thorogood; B.J. Kennedy; J.A. Kimpton; G.J. Griffiths; Paul Guagliardo; G.R. Lumpkin; E.R. Vance

doi:10.1016/j.jnucmat.2014.05.021

Cation antisite disorder in uranium-doped gadolinium zirconate pyrochlores

D.J. Gregg, Z. Zhang, G.J. Thorogood, B.J. Kennedy, J.A. Kimpton, G.J. Griffiths, Paul Guagliardo, G.R. Lumpkin, E.R. Vance

Centre for Microscopy, Characterisation & Analysis

Research output: Contribution to journal › Article › peer-review

36 Citations (Scopus)

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.

Original language	English
Pages (from-to)	474-478
Journal	Journal of Nuclear Materials
Volume	452
Issue number	1-3
Early online date	17 May 2014
DOIs	https://doi.org/10.1016/j.jnucmat.2014.05.021
Publication status	Published - Sept 2014

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title = "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. {\textcopyright} 2014 Elsevier B.V. All rights reserved.",

author = "D.J. Gregg and Z. Zhang and G.J. Thorogood and B.J. Kennedy and J.A. Kimpton and G.J. Griffiths and Paul Guagliardo and G.R. Lumpkin and E.R. Vance",

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language = "English",

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TY - JOUR

T1 - Cation antisite disorder in uranium-doped gadolinium zirconate pyrochlores

AU - Gregg, D.J.

AU - Zhang, Z.

AU - Thorogood, G.J.

AU - Kennedy, B.J.

AU - Kimpton, J.A.

AU - Griffiths, G.J.

AU - Guagliardo, Paul

AU - Lumpkin, G.R.

AU - Vance, E.R.

PY - 2014/9

Y1 - 2014/9

N2 - 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.

AB - 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.

U2 - 10.1016/j.jnucmat.2014.05.021

DO - 10.1016/j.jnucmat.2014.05.021

M3 - Article

SN - 0022-3115

VL - 452

SP - 474

EP - 478

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

IS - 1-3

ER -

Cation antisite disorder in uranium-doped gadolinium zirconate pyrochlores

Abstract

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