Activity of Iron Oxide in Magnesiowüstite in Equilibrium with Solid Metallic Iron

Abstract

By employing an electrochemical technique incorporating magnesia-stabilized zirconia electrolyte, the activities of iron oxide, Fe_xO, were measured in magnesiowüstite, Fe_xO–MgO solid solution, in equilibrium with solid metallic iron at temperatures between 1373 and 1573 K. The sub-regular solution model was applied to the Fe_xO activities, and the calculated Fe_xO activities were in good agreement with the experimental values in this study and the literatures at temperatures between 1073 and 1573 K with an accuracy of ±0.02.