THE SECTION (FE0.5NI0.5)(X)SB1-X - PHASE-RELATIONSHIPS AND THERMODYNAMIC PROPERTIES

A vertical section through the ternary Fe-Ni-Sb phase diagram with an Fe:Ni ratio of 1:1 was studied by thermal analyses and X-ray powder me thods in the composition range between 42 and 90 at.% Sb. Antimony Vap or pressures were determined in the ternary phase (Fe0.5Ni0.5)(1+/-x) Sb between 45.5 and 51.5 at.% Sb and between 1020 and 1310 K by an iso piestic method. The partial molar properties of antimony were derived at 1173 K. A theoretical model based on a statistical distribution of interstitial metal atoms and metal vacancies over their respective lat tice sites was applied to the experimental activity data at 1173 K.