Abstract
Abstract The activity-composition relations in ortho-, and metasilicate solid solutions in the FeO-MgO-SiO2 system are determined at 1204°C on the basis of the measurement of equilibrium oxygen partial pressures. Both the olivine and the pyroxene solid solutions show significant deviations from ideality. Using the present data, the standard free energy change of formation of ferrosilite (hypothetical compound, FeSiO3) is calculated to be −41.7±0.2 kcal/mol on the basis of the equilibrium between metallic iron and silica, and to be −1.6±0.2 kcal/mol on the wüstite (“FeO”) and silica.
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