A Thermodynamic analysis of the system Fe-Ni-O

Abstract

Thermodynamic properties and the phase diagram of the ternary system Fe-Ni-O have been critically assessed using the Thermo-Calc program version J (module Parrot) using simultaneously thermodynamic and phase diagram measurements. Experimental data were available mainly for solid phase relations near 1000°C. The miscibilily gap in the liquid phase has been determined at 1600°C. The excess Gibbs energies were expressed by Redlich-Kister polynomials for the solid metallic phases, by the two sublattice “ionic liquid” model for the liquid phase and by the “compound energy” model for solid oxldic phases. The complete Gibbs energy expressions for the alloy phases were presented allowing calculation of the phase diagram and thermodynamic mixing properties of the mixture phases.