Activities of Oxygen in Liquid Ag–Bi and Ag–Tl Alloys

抄録

The activity coefficients of oxygen, γ_O, in liquid Ag–Bi and Ag–Tl alloys at 1273 K have been measured over the entire composition range utilizing a modified coulometric titration method with the electrochemical cell: O in liquid Ag–Bi or Ag–Tl alloys/ZrO₂(+CaO)/Air, Pt. The measured ln γ_O values for both systems, plotted in terms of alloy composition, lie on upwardly concave curves. The data were found to be somewhat larger than those calculated from Jacob and Alcock’s quasi-chemical equation. This trend appears to be in line with the observation for the Ag–Pb–O system.