Free energies of mixing in the liquid iron-cobalt orthosilicates at 1450°c

Abstract

Measurements have been made of the equilibrium between liquid iron-cobalt orthosilicates and solid iron-cobalt alloys. It is shown that the integral free energies of mixing of the oxide components and the integral and partial molar free energies of mixing of the pseudobinary (orthosilicate) components can be derived from a knowledge of the metallic activities in such exchange equilibria. The thermodynamic properties are presented for 1450°C. It is found that the integral free energy of mixing shows a maximum deviation of −2.1 (±0.3) kJ per mole of MO • 1/2 SiO2 from ideal silicate mixing.