The incorporation of plutonium in lanthanum zirconate pyrochlore

Daniel J. Gregg; Yingjie Zhang; Simon C. Middleburgh; Steven D. Conradson; Gerry Triani; Gregory R. Lumpkin; Eric R. Vance

doi:10.1016/j.jnucmat.2013.07.030

The incorporation of plutonium in lanthanum zirconate pyrochlore

Daniel J. Gregg
, Yingjie Zhang
, Simon C. Middleburgh
, Steven D. Conradson
, Gerry Triani
, Gregory R. Lumpkin
, Eric R. Vance

Australian Nuclear Science and Technology Organisation

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

Abstract

The incorporation of plutonium (Pu) within lanthanum zirconate pyrochlore was investigated using air, argon, and N-2-3.52 sintering atmospheres together with Ca2+ and Sr2+ incorporation for charge compensation. The samples have been characterised in the first instance by X-ray diffraction (XRD), scanning electron microscopy (SEM) and diffuse reflectance spectroscopy (DRS). The results show Pu can be exchanged for La3+ on the A-site with and without charge compensation and for Zr4+ on the B-site. DRS measurements were made over the wavenumber range of 4000-19,000 cm(-1) and the Pu in all air- and argon-sintered samples was found to be present as Pu4+ while that in samples sintered in N-2-3.52 was present as Pu3+. The Pu valence was confirmed for three of the samples using X-ray near-edge absorption spectroscopy (XANES). Pu valences >4+ were not observed in any of the samples. (C) 2013 Elsevier B.V. All rights reserved.

Original language	Unknown
Pages (from-to)	444-451
Number of pages	8
Journal	Journal of Nuclear Materials
Volume	443
Issue number	1-3
DOIs	https://doi.org/10.1016/j.jnucmat.2013.07.030
Publication status	Published - 1 Nov 2013
Externally published	Yes

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10.1016/j.jnucmat.2013.07.030

Cite this

@article{377a35f6caa4441894b059ede389730e,

title = "The incorporation of plutonium in lanthanum zirconate pyrochlore",

abstract = "The incorporation of plutonium (Pu) within lanthanum zirconate pyrochlore was investigated using air, argon, and N-2-3.52 sintering atmospheres together with Ca2+ and Sr2+ incorporation for charge compensation. The samples have been characterised in the first instance by X-ray diffraction (XRD), scanning electron microscopy (SEM) and diffuse reflectance spectroscopy (DRS). The results show Pu can be exchanged for La3+ on the A-site with and without charge compensation and for Zr4+ on the B-site. DRS measurements were made over the wavenumber range of 4000-19,000 cm(-1) and the Pu in all air- and argon-sintered samples was found to be present as Pu4+ while that in samples sintered in N-2-3.52 was present as Pu3+. The Pu valence was confirmed for three of the samples using X-ray near-edge absorption spectroscopy (XANES). Pu valences >4+ were not observed in any of the samples. (C) 2013 Elsevier B.V. All rights reserved.",

author = "Gregg, \{Daniel J.\} and Yingjie Zhang and Middleburgh, \{Simon C.\} and Conradson, \{Steven D.\} and Gerry Triani and Lumpkin, \{Gregory R.\} and Vance, \{Eric R.\}",

year = "2013",

month = nov,

day = "1",

doi = "10.1016/j.jnucmat.2013.07.030",

language = "Anadnabyddus",

volume = "443",

pages = "444--451",

journal = "Journal of Nuclear Materials",

issn = "0022-3115",

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TY - JOUR

T1 - The incorporation of plutonium in lanthanum zirconate pyrochlore

AU - Gregg, Daniel J.

AU - Zhang, Yingjie

AU - Middleburgh, Simon C.

AU - Conradson, Steven D.

AU - Triani, Gerry

AU - Lumpkin, Gregory R.

AU - Vance, Eric R.

PY - 2013/11/1

Y1 - 2013/11/1

N2 - The incorporation of plutonium (Pu) within lanthanum zirconate pyrochlore was investigated using air, argon, and N-2-3.52 sintering atmospheres together with Ca2+ and Sr2+ incorporation for charge compensation. The samples have been characterised in the first instance by X-ray diffraction (XRD), scanning electron microscopy (SEM) and diffuse reflectance spectroscopy (DRS). The results show Pu can be exchanged for La3+ on the A-site with and without charge compensation and for Zr4+ on the B-site. DRS measurements were made over the wavenumber range of 4000-19,000 cm(-1) and the Pu in all air- and argon-sintered samples was found to be present as Pu4+ while that in samples sintered in N-2-3.52 was present as Pu3+. The Pu valence was confirmed for three of the samples using X-ray near-edge absorption spectroscopy (XANES). Pu valences >4+ were not observed in any of the samples. (C) 2013 Elsevier B.V. All rights reserved.

AB - The incorporation of plutonium (Pu) within lanthanum zirconate pyrochlore was investigated using air, argon, and N-2-3.52 sintering atmospheres together with Ca2+ and Sr2+ incorporation for charge compensation. The samples have been characterised in the first instance by X-ray diffraction (XRD), scanning electron microscopy (SEM) and diffuse reflectance spectroscopy (DRS). The results show Pu can be exchanged for La3+ on the A-site with and without charge compensation and for Zr4+ on the B-site. DRS measurements were made over the wavenumber range of 4000-19,000 cm(-1) and the Pu in all air- and argon-sintered samples was found to be present as Pu4+ while that in samples sintered in N-2-3.52 was present as Pu3+. The Pu valence was confirmed for three of the samples using X-ray near-edge absorption spectroscopy (XANES). Pu valences >4+ were not observed in any of the samples. (C) 2013 Elsevier B.V. All rights reserved.

U2 - 10.1016/j.jnucmat.2013.07.030

DO - 10.1016/j.jnucmat.2013.07.030

M3 - Erthygl

SN - 0022-3115

VL - 443

SP - 444

EP - 451

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

IS - 1-3

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