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Thermodynamic and Structural Models Compared with the Initial Dissolution Rates of “SON” Glass Samples

Published online by Cambridge University Press:  25 February 2011

I. Tovena ,
T. Advocat ,
D. Ghaleb ,
E. Vernaz  and
F. Larche
I. Tovena
Affiliation:
CEA Rhône Valley Nuclear Research Center-SCD, BP 171, 30200 Bagnols-sur-Cèze Cedex, France
T. Advocat
Affiliation:
CEA Rhône Valley Nuclear Research Center-SCD, BP 171, 30200 Bagnols-sur-Cèze Cedex, France
D. Ghaleb
Affiliation:
CEA Rhône Valley Nuclear Research Center-SCD, BP 171, 30200 Bagnols-sur-Cèze Cedex, France
E. Vernaz
Affiliation:
CEA Rhône Valley Nuclear Research Center-SCD, BP 171, 30200 Bagnols-sur-Cèze Cedex, France
F. Larche
Affiliation:
Laboratoire de Dynamique des Phases Condensés, Université de Montpellier II, France
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Abstract

The experimentally determined initial dissolution rate R0 of nuclear glass was correlated with thermodynamic parameters and structural parameters. The initial corrosion rates of six “R7T7” glass samples measured at 100°C in a Soxhlet device were correlated with the glass free hydration energy and the glass formation enthalpy. These correlations were then tested with a group of 26 SON glasses selected for their wide diversity of compositions. The thermodynamic models provided a satisfactory approximation of the initial dissolution rate determined under Soxhlet conditions for SON glass samples that include up to 15 wt% of boron and some alumina. Conversely, these models are inaccurate if the boron concentration exceeds 15 wt% and the glass contains no alumina. Possible correlations between R0 and structural parameters, such as the boron coordination number and the number of nonbridging oxygen atoms, were also investigated. The authors show that R0 varies inversely with the number of 4-coordinate boron atoms; conversely, the results do not substantiate published reports of a correlation between R0 and the number of nonbridging oxygen atoms.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 333: Symposium V – Scientific Basis for Nuclear Waste Management XVII , 1993 , 595
Copyright
Copyright © Materials Research Society 1994

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References

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