New formulae for calculating activities from binary system phase diagrams containing solid solution by introducing the parameterθ

New formulae for calculating activities and activity coefficients from binary phase diagrams containing solidsolution are presented. In the new formulae, a parameterθ is introduced. It seems be more efficient The application ofthese formulae to system Ag-Pb proves its efficiency.

由含二元简单共晶的相图提取活度的新方法

New formulae for calculating activities of components from a binary simple eutectic phase diagram are presented in this paper. In the new formulae, activity coeffi cients are considered as functions of the composition of the system. Application of these formulae to system Cu-Bi shows that the new formulae are satisfatory.

引入θ参数导出由共晶相图提取活度的新公式

借助于引入θ参数所得到的组元的活度系数与温度间的新关系式，导出了由二元简单共晶的相图计算组元活度的修正式。应用本文的新公式计算了１２００Ｋ下Ｃｕ－Ｂｉ二元系中Ｃｕ－Ｂｉ的活度，结果表明经修正后的公式与实测数据吻合。