Thermodynamic optimization of the Ni-Zn system

Optimization of thermodynamic and phase diagram data has been performed and consistent sets of coefficients for the calculation of the phase equilibria in the system Ni-Zn have been obtained using the program BINGSS. The delta phase has been modeled as a stoichiometric compound (NiZn8). The binary liquid and the solid Ni-based solutions have been treated as disordered substitutional phases. The intermediate beta, beta(1), and gamma compounds have been modeled as phases with substitutional defects and vacancies on two sublattices. The calculated phase diagram and thermodynamic quantities are in excellent agreement with the experimental data.