A thermodynamic evaluation of the Au-Sn system

Available experimental information concerning thermodynamic properties as well as phase equilibria data has been compiled and used for the assessment of new self-consistent parameters of thermodynamic models for all phases in the Au-Sn system. These coefficients have been optimized by using a program developed by Lukas et al. Calphad, 1 (1977) 225. Phase diagram and characteristic thermodynamic functions have been calculated and compared with the experimental values using the THERMODATA software. A very satisfactory agreement has been obtained by using twenty-eight optimized coefficients for about five hundred experimental points, with a simple substitutional model for solution phases and a linear approximation for the temperature dependency of the Gibbs energy of the stoicheiometric compounds.