The heat of formation of dilute solution of lanthanide in bismuth

The heat of formation of dilute solution of lanthanide in bismuth was deduced from the activity coefficient of lanthanide in bismuth solution. The experimental values were compared with estimations of these values using Miedema's model. There is a simplified linear relation of the heat of formation of liquid Ln–Bi alloys with the 2/3 power of the metallic volumes of lanthanides, which is a useful tool for predicting the current unknown values. By introducing a correction constant in the Miedema's model, the predicted data agreed well with experimental data.