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Activities of FeO in CaO-SiO2-Al2O3-MgO-FeO slags were determined at 1 673 K by electrochemical measurements of the solid electrolyte cell: Mo |Mo+MoO2|ZrO2(MgO)|Fe+(CaO-SiO2-Al2O3-MgO-FeO)+Ag|Fe. The influences of slag compositions and basicity on FeO ac