Abstract
Abstract An optimized set of thermodynamic functions of the Ni-Nb system has been obtained using phase diagram data and thermodynamic data from the literature. The excess free energies of solution phases, liquid and two terminal solid solutions (Ni) and (Nb), were described by the Redlich-Kister formula. Two compound phases, Ni 3 Nb and Ni 6 Nb 7 , were described by the Wagner-Schottky model: Ni 3 Nb was modelled with two sublattices assuming anti-structure atoms on both sublattices, and Ni 6 Nb 7 was modelled with four sublattices after the formula (Ni,Nb) 2 (Nb,Ni) 1 (Ni) 4 (Nb) 6 , where the second atoms in the first and second brackets are anti-structure atoms. Optimization and calculation were performed alternately with different selections of data in order to get the most acceptable compromise between the scattered experimental data. The calculated phase diagram agrees very well with the experimental values from the literature.
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