Abstract
The determination of partial pressures of UO 3(g) and O 2(g) over UO 2 + x (s) as function of the O/U ratio was attempted at 1473, 1673, 1773 and 1873 K under the condition of the decreasing O/U ratio of the condensed phase by Knudsen effusion mass spectrometry. From these vapor pressures the Gibbs free energy of formation of UO 3(g), Δ G f 0(UO 3,g), was also evaluated. The partial pressures of O 2(g) over UO 2 + x (s) obtained in this study almost agreed with the experimental data reported in the past as well as the values derived from the empirical equation given by Nakamura and Fujino. Further, it was found that the values of Δ G f 0(UO 3,g) obtained in this study were in good agreement with the recommended values.
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