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Nature and Effect of the Alteration Layer During Nuclear Waste Glass Dissolution

Published online by Cambridge University Press:  21 March 2011

A. Gauthier ,
P. Le Coustumer  and
J-H. Thomassin
A. Gauthier
Affiliation:
UMR CNRS PBDS, USTL, UFR Sciences de la Terre, 59655 Villeneuve d'Ascq Cedex France UMR CNRS 6532, ESIP, LMGE, 40, av. du Recteur Pineau 86022 Poitiers Cedex, France
P. Le Coustumer
Affiliation:
CDGA, Université Bordeaux1, Av. des facultés, 33405 Talence cedex, France
J-H. Thomassin
Affiliation:
UMR CNRS 6532, ESIP, LMGE, 40, av. du Recteur Pineau 86022 Poitiers Cedex, France
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Abstract

The goal of this study is to understand the role of the interface developed during R7T7 glass alteration. This glass has been leached in two different aqueous media (pure water, silica rich water and phosphorous rich water). The lixiviation tests have been optimized to assess the role of the alteration layer developed on the surface of the glass. The solution and the solid have been characterized by ICP-MS and TEM/X-EDS respectively. The results put in evidence that a complex alteration layer is formed. Its texture, structure and chemistry are discussed with respect to the evolution of the solution during the tests. The alteration layer is always present on the surface of the glass and is considered to control (at short time) diffusion of the different species through the layer. Further study must be undertaken to assess the evolution and the stability of the interface for longer time periods.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 713: Symposium JJ – Scientific Basis for Nuclear Waste Management XXV , 2002 , JJ13.4
Copyright
Copyright © Materials Research Society 2002

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References

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