Thermodynamic description of Ru–Ge–Si ternary system

With the help of Miedema's method, Ru–Ge–Si ternary system has been thermodynamically described through the CALPHAD approach. Firstly, mixing enthalpy of liquid Ru–Ge alloy was calculated in light of Miedema's empirical method. Subsequently, the Ru–Ge and Ru–Si binary systems were thermodynamically assessed. Solution phases including Liquid, Hcp and Diamond were described with a substitutional model, of which the excess Gibbs energies were formulated with the Redlich–Kister polynomial. Binary intermetallic phases were treated as stoichiometric compounds. Then, combined with the reported parameters of Ge–Si system, phase equilibria in the ternary Ru–Ge–Si system were assessed where the ternary solubility in intermetallic compounds was taken into consideration. In addition, liquidus projection was further calculated.