Wilson equation is applied to the ternary ilmenite solid solution, (Fe, Mn, Mg) TiO
3, for describing the excess molar Gibbs free energy of mixing (G
ex). Non-linear programming technique is used to derive the parameters of the equation from the ilmenite-fluid equilibrium experiments at 600°C and 1000 kgf/cm
2 by Kubo et al. (1992). The excess molar Gibbs free energy of mixing for ilmenite is obtained as G
ex=-873.15R{X
Fe in (X
Fe+1.056X
Mn+ 0.878X
Mg)+X
Mn ln (0.704X
Fe+X
Mn+0.424X
MS)+X
Mg ln (0.450X
Fe+0.326X
Mn+X
Mg)}, where X stands for the mole fraction of the subscript component (Fe as FeTiO
3, Mn as MnTiO
3, Mg as MgTiO
3) and R denotes the gas constant. Fluid compo-sitions in equilirium with the ternary ilmenite solid solution are also obtained. The calculated results of the GeX values and the fluid compositions agree well with the experimental results, suggesting the usefulness of the Wilson equation.
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