Critical evaluation and thermodynamic optimization of the Na₂O-FeO-Fe₂O₃-Al₂O₃-SiO₂ system

详细信息    查看全文

• 作者：Elmira Moosavi-Khoonsari ; In-Ho Jung ; ^{in-ho.jung@mcgill.ca" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Na2O&ndash ; FeO&ndash ; Fe2O3&ndash ; Al2O3&ndash ; SiO2 ; Thermodynamic optimization ; Phase diagrams ; Solid solutions
• 刊名：Journal of the European Ceramic Society
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：37
• 期：2
• 页码：787-800
• 全文大小：3850 K

文摘

A critical assessment and thermodynamic optimization of phase diagrams and thermodynamic properties of the entire Na₂O–FeO–Fe₂O₃–Al₂O₃–SiO₂ system were carried out at 1 atm total pressure. A set of optimized model parameters obtained for all phases present in this system reproduces available and reliable thermodynamic property and phase equilibrium data within experimental error limits from 298 K to above liquidus temperatures for all compositions and oxygen partial pressures from metallic Fe saturation to 1 atm. The Gibbs energy of liquid solution was described based on the Modified Quasichemical Model considering the possible formation of NaAlO₂ and NaFeO₂ associates in the liquid state. The solid solutions wüstite, spinel, feldspar, nepheline, carnegieite, mullite, corundum, clino-pyroxene, meta-oxides and Na-β″-alumina were treated within the framework of Compound Energy Formalism. The database of model parameters can be used to calculate any thermodynamic property and phase diagram section of the present system.