Ce and U speciation in wasteforms for thermal treatment of plutonium bearing wastes, probed by L3 edge XANES

Abstract

X-ray absorption spectroscopy was applied to understand the speciation of elements relevant to the immobilisation and disposal of radioactive plutonium bearing wastes, utilizing Ce as a Pu surrogate. Ce L3 XANES (X-ray Absorption Near Edge Structure) characterisation of a crystallised glass material produced by cold crucible plasma vitrification, at demonstration scale, evidenced incorporation as Ce3+ within the glass phase, providing an important validation of laboratory scale studies. U and Ce L3 XANES investigation of brannerite ceramics, U0.9Ce0.1Ti2O6, synthesized under oxidizing, neutral and reducing conditions, established the charge compensation mechanism as incorporation of Ce3+ through formation of U5+ and/or U6+ In each of these examples, X-ray Absorption Spectroscopy has provided a pivotal understanding of element speciation in relation to the mechanism of incorporation within the host wasteform intended for geological disposal.

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Item Type:	Article
Authors/Creators:	Bailey, D.J. https://orcid.org/0000-0002-0313-8748 Stennett, M.C. https://orcid.org/0000-0002-8363-9103 Sun, S.K. Gardner, L.J. https://orcid.org/0000-0003-3126-2583 Walling, S.A. Corkhill, C.L. https://orcid.org/0000-0002-7488-3219 Ravel, B. Hyatt, N.C.
Copyright, Publisher and Additional Information:	© 2020 The Authors. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence (https://creativecommons.org/licenses/by/3.0/). Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
Dates:	Published: 1 April 2020
Institution:	The University of Sheffield
Academic Units:	The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Materials Science and Engineering (Sheffield)
Funding Information:	Funder Grant number ROYAL ACADEMY OF ENGINEERING (THE) UNSPECIFIED ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL EP/M026566/1 DEPARTMENT OF ENERGY AND CLIMATE CHANGE NONE ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL EP/N017374/1 ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL RG.IPSE.109543 US DEPARTMENT OF ENERGY UNSPECIFIED ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL EP/T011424/1
Depositing User:	Symplectic Sheffield
Date Deposited:	11 May 2020 08:03
Last Modified:	11 May 2020 08:03
Status:	Published
Publisher:	IOP Publishing
Refereed:	Yes
Identification Number:	10.1088/1757-899x/818/1/012019
Open Archives Initiative ID (OAI ID):	oai:eprints.whiterose.ac.uk:160354

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Ce and U speciation in wasteforms for thermal treatment of plutonium bearing wastes, probed by L3 edge XANES

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