Thermodynamic properties of Si-Ge and Si-Sn melts

The mixing enthalpies of Si-Ge and Si-Sn liquid alloys were measured in an isoperibolic calorimeter. The results demonstrate that the formation of Si- Ge melts is accompanied by a small heat release, while the formation of Si- Sn melts is an endothermic process. Calculations of the Si activity in Si-S n melts by Schroeder's equation indicate large positive deviations from Rao ult's law.