Abstract
Basic information on the processing and performance of silicate, borate, and halide glass systems is relatively sparse, owing to the adverse experimental conditions of high temperature, chemical reactivity and complex multiphase interactions. A thermodynamic model is described for the prediction of phase equilibria and vapor pressures for a wide variety of glass systems. Systems tested to date include mixtures of Li 2O, Na 2O, K 2O, CaO, MgO, Al 2O 3, Fe 2O 3 and SiO 2, in addition to molten salts. The model is based on the formation of actual or hypothetical chemical complexes in the liquid and solid phases. As such, it is similar, though not identical, to the associate liquid model used successfully for alloys. The model and its thermodynamic data base have been validated by comparison with experimental activity data for well-characterized solid and liquid glass systems.
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