科研之友
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摘要
A coupled key phase diagram experimental study and thermodynamic modeling of the SiO2-P2O5 system was conducted. Equilibration and quenching experiments using sealed Pt crucibles were performed in the SiO2-rich region to resolve inconsistencies found in the literature data about the SiO2 liquidus. Based on new experimental data and all available and reliable phase diagram and thermodynamic data, the thermodynamic optimization of the SiO2-P2O5 system was carried out to obtain a set of thermodynamic equations for liquid and solid phases in the system. The liquidus slope of SiO2 indicates that P2O5 in the SiO2-rich liquid exists mainly in the form of P2O7 (4-) instead of PO4 (3-). Thermodynamic properties of the liquid solution can be predicted from the Gibbs energy of the liquid phase.
- 出版日期2013-8
