Thermodynamic modeling of the germanium–nickel system

A thermodynamic optimization of the Ge–Ni system was carried out and a set of thermodynamic parameters were obtained. The substitutional solution model was used to describe the liquid and FCC (Ni) terminal solid solution phases. The two-sublattice model was used to describe the non-stoichiometric compounds βNi3Ge, ɛNi5Ge3, Ni19Ge12 and Ni3Ge2. The γNi3Ge, δNi5Ge2, Ni2Ge, ɛ′Ni5Ge3 and NiGe phases were modeled as stoichiometric compounds. The calculated phase diagram and thermodynamic properties agree well with most of the experimental data.