Thermodynamic analysis of the system Bi-Au2Bi

Results of the experimental thermodynamic investigations of the system Bi-A u2Bi obtained by using Oelsen calorimetry are presented in this paper. Acti vities, activity coefficients and partial molar quantities for bismuth in t he temperature interval 600-1000 K are determined. Based on the values of t he thermodynamic parameters, negative deviation from Raoult law was obtaine d for the investigated system. Also, bismuth activities and activity coeffi cients dependence on composition and temperature is calculated by the nonli near programming using gradient method.