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Report No.

Measurement of oxygen potential of (U$$_{0.8}$$Pu$$_{0.2}$$)O$$_{2pm x}$$ at 1773 and 1873 K, and its analysis based on point defect chemistry

Kato, Masato  ; Nakamichi, Shinya ; Takeuchi, Kentaro ; Sunaoshi, Takeo*

Uranium and plutonium mixed oxide (MOX) has been used as fuels of fast reactors. The MOX having fluorite structure is an oxygen nonstoichiometric compound which is stable in hyper- and hypo-stoichiometric composition range. The stoichiometry of MOX significantly affects their properties. So, it is essential to know the relation between stoichiometry and oxygen potential to develop MOX fuels. In this work, the oxygen potentials of (U$$_{0.8}$$Pu$$_{0.2}$$)O$$_{2pm x}$$ were measured at high temperatures of 1773, and 1873K. The measurements were carried out by gas equilibrium method using thermo-gravimetry. Th The oxygen partial pressure was adjusted by controlling the ratio of H$$_{2}$$/H$$_{2}$$O in the flowing gas atmosphere, and the oxygen potential was determined. The oxygen potentials were determined as functions of O/M ratio, and temperature. The data at stoichiometric composition were estimated to be -311kJ/mol and -299kJ/mol at 1773K, and 1873K based on point defect model.



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