High Temperature Thermochemistry Laboratory고온열화학연구실

A complete literature review, critical evaluation, and thermodynamic optimization of phase diagrams and thermodynamic properties of the Na₂O-FeO-Fe₂O₃-SiO₂ system were performed at 1 atm total pressure. A set of optimized model parameters obtained for all phases present in this system reproduces available and reliable thermodynamic properties and phase equilibria within experimental error limits from 298 K (25 °C) to above liquidus temperatures for all compositions and oxygen partial pressures from metallic Fe saturation to 1 atm. The liquid phase was modeled based on the Modified Quasichemical Model considering the possible formation of NaFeO₂ associate in the liquid state. The NaFeO₂ metaoxide solid solutions containing the excess SiO₂ were described within the framework of Compound Energy Formalism. Based on the thermodynamic models and model parameters, unexplored thermodynamic properties and phase diagrams of the Na₂O-FeO-Fe₂O₃-SiO₂ system were predicted.