A thermodynamic study has been made of the vanadium-oxygen system utilizing the solid state galvanic cell technique. Investigations were made over the temperature range 700-1200°C (973-1473 K) with a ThO2Y2O3electrolyte. The terminal solubility of oxygen in vanadium was determined. The activity of oxygen obeys Henry's law for the temperatures of this investigation for compositions up to 3.2 at.% oxygen. For higher compositions the activity coefficient shows positive deviations from Henry's law. A mathematical expression was determined to describe the activity coefficient as a function of temperature and composition. The change in the thermodynamic properties of oxygen when molecular oxygen dissolves in vanadium and the equilibrium oxygen pressure over vanadiumoxygen solid solutions were determined. The terminal solubility and equilibrium oxygen pressures for the vanadium-oxygen system were compared to those for the niobium-oxygen and tantalum-oxygen systems. © 1976.
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