Energetics of mixing in Bi–Pb and Sb–Sn liquid alloys

We have analysed the energetics of mixing of Bi–Pb and Sb–Sn liquid alloys at respective temperatures 700 and 905 K through the study of their thermodynamic functions and surface properties using four atom cluster model and quasichemical approximation (QCA) approach, respectively. Our study reveals that the two systems exhibit chemical order or heterocoordination, with the degree of chemical order in Sb–Sn being more than that of Bi–Pb. We also observed that while Bi-atoms segregate to the surface of Bi–Pb alloy, Sb-atoms segregate to the surface of Sb–Sn alloys. The degree of segregation of Sb-atoms being more than that of Bi-atoms.