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Thermochemical Models for Nuclear Waste Glass Subsystems – MgO-CaO and MgO-Al2O3

Published online by Cambridge University Press:  10 February 2011

T. M. Besmann ,
K. E. Spear  and
E. C. Beahm
T. M. Besmann
Affiliation:
Oak Ridge National Laboratory, P. O. Box 2008, Oak Ridge, TN 37831-6063
K. E. Spear
Affiliation:
Materials Science and Engineering Department, Pennsylvania State University, 118 Steidle Building, University Park, PA 16802-5005
E. C. Beahm
Affiliation:
Oak Ridge National Laboratory, P. O. Box 2008, Oak Ridge, TN 37831-6063
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Abstract

A relatively simple model, the associate species model, is being applied to nuclear waste glass compositions in order to accurately predict behavior and thermodynamic activities in the material. In the model, the glass is treated as a supercooled liquid, with the liquid species allowed to exist below their melting point. The approach requires an initial assembly of binary and ternary oxide liquid solution data that sufficiently reproduce the equilibrium phase diagrams. Two binary oxide subsystems, MgO-CaO and MgO-Al2O3, have been modeled and results compared to published phase diagrams. Computed activities of the glass constituent species are plotted as a function of composition at 1200°C.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 556: Symposium QQ – Scientific Basis for Nuclear Waste Management XXII , 1999 , 383
Copyright
Copyright © Materials Research Society 1999

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References

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