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Property measurements of (U$$_{0.7}$$,Pu$$_{0.3}$$)O$$_{2-x}$$ in $$P$$$$_{O2}$$-controlled atmosphere

Kato, Masato  ; Murakami, Tatsutoshi ; Sunaoshi, Takeo*; Nelson, A. T.*; McClellan, K.*

Uranium and plutonium mixed oxide (U$$_{0.7}$$,Pu$$_{0.3}$$)O$$_{2-x}$$ which has been developed as a fast reactor fuel is nonstoichiometric compound. The stoichiometry significantly affects various properties. The relationship between oxygen potential and oxygen-to-metal (O/M) ratio has been investigated so far. The measurement results showed that it is essential to control oxygen partial pressure ($$P$$$$_{O2}$$) for holding constant O/M ratio in high temperature range. Therefore, properties of (U$$_{0.7}$$,Pu$$_{0.3}$$)O$$_{2-x}$$ were measured in $$P$$$$_{O2}$$-controlled atmosphere in this work. In this work, properties of O/M change, sintering and thermal expansion were investigated in $$P$$$$_{O2}$$-controlled atmosphere.

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