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In Situ Characterisation of Model UK Nuclear Waste Glasses by X-ray Absorption Spectroscopy Under Process Conditions

Published online by Cambridge University Press:  01 February 2011

Neil C. Hyatt ,
Andrew J. Connelly ,
Martin C. Stennett ,
Francis R. Livens  and
Robert L. Bilsborrow
Neil C. Hyatt
Affiliation:
Immobilisation Science Laboratory, Department of Engineering Materials, The University of Sheffield, Mappin Street, Sheffield, S1 3JD. UK.
Andrew J. Connelly
Affiliation:
Immobilisation Science Laboratory, Department of Engineering Materials, The University of Sheffield, Mappin Street, Sheffield, S1 3JD. UK.
Martin C. Stennett
Affiliation:
Immobilisation Science Laboratory, Department of Engineering Materials, The University of Sheffield, Mappin Street, Sheffield, S1 3JD. UK.
Francis R. Livens
Affiliation:
Centre for Radiochemistry Research, Department of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL. UK.
Robert L. Bilsborrow
Affiliation:
STFC Daresbury Laboratory, Warrington, Cheshire, WA4 4AD. UK.
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Abstract

The local co-ordination environment of Zr in a model alkali borosilicate glass, of relevance to nuclear waste immobilisation, was studied by in situ X-ray absorption spectroscopy between 25 – 1060°C. Analysis of Zr K-edge XANES spectra, in comparison with those of well characterised standards, demonstrated, for the first time, the reversible transformation of ZrO6 to ZrO7 co-ordination polyhedra at high temperature. This observation was rationalised on the basis of the combined effects of network modifier cation diffusion and thermal expansion.

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Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1107: Scientific Basis for Nuclear Waste Management XXXI , 2008 , 223
Copyright
Copyright © Materials Research Society 2008

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