정규회합체 모델을 이용한 액상 합금의 혼합엔탈피 계산에 관한 연구

The concentration and temperature dependence of the mixing enthalpies of liquid Cu-Sb, Sb-Sn, Cu-Sn and Cu-Sb-Sn alloys could be described by the regular associate solution model. A new numerical method which uses the least square method and the Newton-Raphson method is proposed for the calculation of the model parameters. The calculation shows that the free energy of mixing of liquid Cu-Sb alloy can be much better described with CuSb and Cu₃Sb associates than with Cu₂Sb or Cu₃Sb associate alone. The mixing enthalpies of Cu-Sn-Sb alloy calculated with the assumption of four kinds of associates are in good agreement with the experimental data. By the calculation the model parameters are fixed using only the data of the three binary bordering systems.