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采用正规溶液模型(RSM)、亚正规溶液模型(SRSM)和分子相互作用体积模型(MIVM)的无限稀活度系数与二元模型参数的关联式,直接确定相应的模型参数.据此,预测了8个锡基三元液态合金Sn-Ag-Bi、Sn-Ag-In、Sn-Ag-Zn、Sn-Bi-Cu、Sn-Cu-Zn、Sn-Ga-Zn、Sn-In-Zn和Sn-Mg-Zn的组元活度,并与对应的实验值比较.预测结果为:RSM、SRSM和MIVM的预测平均标准偏差分别为0.071 6、0.071 9和0.018 3,平均相对误差分别为26%、29%和6%.这表明MIVM的预测效果与RSM和SRSM比较,具有较好的稳定性和可靠性,更接近于这些锡基三元液态合金.因此,应用MIVM预测的结果可以作为含锡液态合金热力学及其相平衡研究的参考数据.
The model parameters are directly determined by using the relationships between the infinite dilute activity coefficient and the binary model parameters of the normal solution model (RSM), the sub-normal solution model (SRSM) and the molecular interaction volume model (MIVM) Eight tin-based ternary liquid alloys Sn-Ag-Bi, Sn-Ag-In, Sn-Ag-Zn, Sn-Bi-Cu, Sn-Cu-Zn, Sn-Ga-Zn, Sn-In-Zn And Sn-Mg-Zn were calculated and compared with corresponding experimental data.The prediction results were as follows: the predicted standard deviations of RSM, SRSM and MIVM were 0.071 6, 0.071 9 and 0.018 3 respectively, the average relative errors were 26%, 29% and 6%, respectively, indicating that the predicted results of MIVM are more stable and reliable than those of RSM and SRSM and are closer to these Sn-based ternary liquid alloys. As tin-containing liquid alloy thermodynamics and phase equilibrium study of the reference data.