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Extension of the Modified Associate Species Thermochemical Model for High-Level Nuclear Waste: Inclusion of Chromia

Published online by Cambridge University Press:  11 February 2011

Theodore M. Besmann ,
Karl E. Spear  and
John D. Vienna
Theodore M. Besmann
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831–6063, USA
Karl E. Spear
Affiliation:
Materials Science and Engineering Department, Pennsylvania State University, University Park, PA 16802
John D. Vienna
Affiliation:
Pacific Northwest National Laboratory, Richland, WA 99352
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Abstract

The successful thermochemical model based on the modified associate species approach for the Na2O-Al2O3-B2O3-SiO2 base glass system has been extended to include a critical constituent, Cr2O3. This includes the Cr2O3-Al2O3 solid solution. For the liquid, and potentially glass phase when undercooling is allowed to occur, the model uses the relative simple, modified associate species method to allow accurate determination of phase relations, including liquidus surfaces. It also allows prediction of chemical activities and vapor pressures, which can be important in both processing and in modeling long-term waste form stability.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 757: Symposium II – Scientific Basis for Nuclear Waste Management XXVI , 2002 , II5.12
Copyright
Copyright © Materials Research Society 2003

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References

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