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Electrochemical Description of Redox Equilibria in Nuclear Glass

Published online by Cambridge University Press:  15 February 2011

O. Pinet  and
S. Mure
O. Pinet
Affiliation:
CEA, DEN, DTCD, SECM, LDMC, 30207 Bagnols sur Ceze Cedex, France
S. Mure
Affiliation:
CEA, DEN, DTCD, SECM, LDMC, 30207 Bagnols sur Ceze Cedex, France
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Abstract

Glass matrices were selected to immobilize fission products because glass is capable of chemically incorporating a wide spectrum of elements within a single matrix. Some of these elements can be found at different oxidation states. The redox equilibrium constants of multivalent species can be used to develop thermodynamic models for a better description of nuclear glasses. Some of the multivalent species loaded in nuclear glass, such as iron and sulfur, have already been a subject of investigation by conventional glassmakers or geochemists in the earth sciences. Other redox species more specifically related to nuclear glass, including cerium and ruthenium, have also been investigated. These studies have demonstrated the advantages of using electrochemical techniques, voltammetry and potentiometry, to determine the equilibrium constants. Oxygen potential measurements are also particularly suitable for characterizing the redox state of the multivalent dissolved species in molten glass.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1193: Scientific Basis for Nuclear Waste Management XXXIII , 2009 , 315
Copyright
Copyright © Materials Research Society 2009

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