Surface interfacial analysis of simulant high level nuclear waste glass dissolved in synthetic cement solutions

Abstract

The corrosion mechanisms and kinetics of a Mg-rich alkali aluminoborosilicate glass simulating UK high-level waste (CaZn28) were investigated upon dissolution in synthetic cement solutions. Dissolution varied as a function the different pH and alkali/alkaline earth content of each cement solution. High resolution microscopy and spectroscopy techniques ascertained the nature of the interface between the glass and the cement solutions. TEM-EDS revealed alkali- and alkaline earth-rich silica gels, into which K, Ca and Mg were incorporated. TEM-SAED, combined with synchrotron micro-focus XRD, identified the ubiquitous precipitation of the Mg-aluminate layered double hydroxide phase, meixnerite (Mg6Al2(OH)18·4H2O), in addition to goethite (FeOOH) and crystalline silica. The C-S-H phase, tobermorite (Ca5Si6O16(OH)2·4H2O), was identified in the most Ca-rich solution only. These data give insight to the role of alkali/alkaline earth-rich solutions in the dissolution or radioactive waste glasses, of importance to the final disposition in a geological disposal facility.

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Item Type:	Article
Authors/Creators:	Corkhill, C.L. https://orcid.org/0000-0002-7488-3219 Mann, C. Eskelsen, J.R. Leonard, D.N. Mottram, L.M. Stennett, M.C. https://orcid.org/0000-0002-8363-9103 Ayling, J.M.S. Thorpe, C.L. https://orcid.org/0000-0002-2860-8611 Cole, M.R. Nicholas, S. Tappero, R. Pierce, E.M.
Copyright, Publisher and Additional Information:	© 2022 The Author(s). This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
Dates:	Published: 18 August 2022 Published (online): 18 August 2022 Accepted: 22 July 2022
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 Engineering and Physical Sciences Research Council EP/N017374/1; EP/G037140/1; EP/S012400/1 Engineering and Physical Sciences Research Council EP/V035215/1; EP/T011424/1
Depositing User:	Symplectic Sheffield
Date Deposited:	25 Aug 2022 11:40
Last Modified:	25 Aug 2022 11:40
Status:	Published
Publisher:	Springer Nature
Refereed:	Yes
Identification Number:	10.1038/s41529-022-00279-5
Open Archives Initiative ID (OAI ID):	oai:eprints.whiterose.ac.uk:190257

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Surface interfacial analysis of simulant high level nuclear waste glass dissolved in synthetic cement solutions

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