Abstract
A modified associate species approach is used to model the liquid phase
in oxide systems.
The relatively simple technique treats oxide liquids as solutions of
end-member and associate species.
The model was extended to representing glasses by treating them as
under-cooled liquids.
Equilibrium calculations using the model allow determination of species
activities, phase separation, precipitation of crystalline phases, and
volatilization.
In support of nuclear waste glass development a model of the
Na2O-Al2O3-B2O3-SiO2
system was developed which accurately reproduces its phase equilibria.
The technique was applied to the CaO-SiO2 system, which is used
to demonstrate how two immisicible liquids can be treated.
Full description of the
Thermochemical Modeling of Oxide Glasses
available (PDF Doc -- Adobe Acrobat required).
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