Activity of oxygen in liquid In-Sb alloys

Abstract

In order to provide fundamental insights into the role of the ratio of the solvent metallic valences (Vb/Va) on the compositional dependence of In γo, the activity coefficients of oxygen, γo, in liquid In-Sb alloys at 1073 K have been measured by modified coulometric titrations on the galvanic cell:O in liquid In-Sb alloys/ZrO2( + CaO)/Air, Pt. Present results indicated the Henrian behavior of oxygen in liquid In-Sb alloys. The dependence of the activity coefficient of oxygen on alloy composition is represented as follows: NIN 0 0.07 0.15 0.30 0.45 0.60 0.80 0.90 1 −lnγo 8.24 8.96 9.64 10.80 11.71 12.59 13.35 13.57 13.64 These results differ significantly from those predicted by Jacob and Alcock's equation and by Wagner's equation combined with Chang et al's correlation of the energy parameter, h. However, by modifying Chang et al's definition of ( Vb/ Va), the Wagner's equation has been found to be capable of approximately describing the compositional dependence of the activity coefficient of oxygen in liquid In-Sb alloys.