Solubility and activity of oxygen in liquid manganese

Abstract

The oxygen concentration of liquid manganese in equilibrium with MnAl_2+2xO_4+3x and α-Al₂O₃ has been determined in the temperature range 1520 to 1875 K. The oxygen content of quenched samples, wrapped in oxygen-free nickel foil, was determined by an inert gas fusion technique. The results are combined with accurate data now available on the Gibbs energies of formation of MnO and Al₂O₃-saturated MnAl_2+2xO_4+3x to derive the oxygen content of liquid manganese in equilibrium with MnO and the Gibbs energy of solution of diatomic oxygen gas in liquid manganese. The enthalpy and entropy of solution of oxygen in manganese are compared with similar data on other metal-oxygen systems.