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 is extended to representing glasses by treating them as undercooled liquids. Equilibrium calculations using the model allow the determination of species activities, phase separation, precipitation of crystalline phases, and volatilization. In support of nuclear waste glass development, a model of the Na20-Al203-B203-Si02 system has been developed that accurately reproduces its phase equilibria.
Origin
Pennsylvania State University, Usa
Journal Title
J Am Ceram Soc 85 12 2002 2887-2894
Sector
Special Glass
Class
S 2470