Metastable eutectic, gas to solid, condensation in the FeO-Fe2O3-SiO2 system

Non-equilibrium gas to solid condensation produced three distinct groupings of ferrosilica solids with compositions similar to 15, 30 and 87.5 wt.% FeO (or, similar to 17, 33 and 97 wt.% Fe2O3). These solid compositions define metastable eutectic points in the FeO/Fe2O3-SiO2 binary system. The position of a silica-rich metastable eutectic is sensitive to the ratio FeO : Fe2O3 during gas-to-solid quenching. The Fe-rich metastable eutectic indicates a two-liquid held in this revised pseudo-binary equilibrium phase diagram.