Oxygen potential of (U0.88Pu0.12)O 2±x and (U0.7Pu0.3)O 2±x at high temperatures of 1673-1873 K

M. Kato, K. Takeuchi, T. Uchida, T. Sunaoshi, K. Konashi

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)


The oxygen potential of (U0.88Pu0.12)O 2±x (-0.0119 < x < 0.0408) and (U 0.7Pu0.3)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, ΔGO2, ΔHO2 and ΔSO2, 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.

Original languageEnglish
Pages (from-to)120-125
Number of pages6
JournalJournal of Nuclear Materials
Issue number2
Publication statusPublished - 2011 Jul 15


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