Oxygen potential of (U0.88Pu0.12)O2±x and (U0.7Pu0.3)O2±x at high temperatures of 1673-1873 K |
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Authors: | M Kato K Takeuchi T Sunaoshi |
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Affiliation: | a Japan Atomic Energy Agency, 4-33 Muramatu, Tokai-mura, Naka-gun, Ibaraki 319-1194, Japan b Inspection Development Company, 4-33 Muramatu, Tokai-mura, Ibaraki 319-1194, Japan c Tohoku University, 2145-2, Narita, Oarai-machi, Ibaraki 311-1313, Japan |
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Abstract: | The oxygen potential of (U0.88Pu0.12)O2±x (−0.0119 < x < 0.0408) and (U0.7Pu0.3)O2±x (−0.0363 < x < 0.0288) was measured at high temperatures of 1673-1873 K using gas equilibrium method with thermo gravimeter. The measured data were analyzed by a defect chemistry model. Expressions were derived to represent the oxygen potential based on defect chemistry as functions of temperature and oxygen-to-metal ratio. The thermodynamic data, and , at stoichiometric composition were obtained. The expressions can be used for in situ determination of the oxygen-to-metal ratio by the gas-equilibration method. The calculation results were consistent with measured data. It was estimated that addition of 1 wt.% Pu content increased oxygen potential of uranium and plutonium mixed oxide by 2-5 kJ/mol. |
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