A New Model for Predicting Ternary Thermodynamic Properties of Solution Phase and Its Application

Zhiyu QIAO Xianran XING Shuzhen DUAN University of Science and Technology Beijing,Beijing,100083,ChinaChaogui ZHENG Beijing University,Beijing,100871,China

摘 要：<正> A new geometric asymmetric model for predicting the thermodynamic properties of ternary systemfrom three sub-binaries is presented in this paper.Its analytical expression with good calculating ac-curacy is most simple in all asymmetric models.The new model was applied to predict the enthalpiesof mixing of the Bi-Ga-Sn.Au-Ag-Sn and NaCl-KCl-CaCl₂ ternary systems which were in goodagreements with experimental data.Based on thermodynamic principles,the importance of thechoice of asymmetric component is also discussed.The error analysis indicates that in the case ofjudging the asymmetric component in ternary system according to the thermodynamic criterion thedeviation is minimum.It is of great significance to improve the calculating accuracy for predictingthermodynamic properties of ternary solution phase from the sub-binary ones.

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