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高温における(U$$_{0.623}$$Pu$$_{0.35}$$Am$$_{0.027}$$)O$$_{2{pm}x}$$の酸素ポテンシャル測定

The Oxygen potential measurement of (U$$_{0.623}$$Pu$$_{0.35}$$Am$$_{0.027}$$)O$$_{2{pm}x}$$ under high temperature

松本 卓; 加藤 正人   ; 森本 恭一 ; 砂押 剛雄*

Matsumoto, Taku; Kato, Masato; Morimoto, Kyoichi; Sunaoshi, Takeo*

(U$$_{0.623}$$Pu$$_{0.35}$$Am$$_{0.027}$$)O$$_{2{pm}x}$$の酸素ポテンシャルを気相平衡法により、1673-1873Kの温度範囲において測定した。得られた結果を格子欠陥の平衡論に基づき解析し、酸素ポテンシャルをO/M比と温度の関数として定式化した。

The oxygen potentials of (U$$_{0.623}$$Pu$$_{0.35}$$Am$$_{0.027}$$)O$$_{2{pm}x}$$ were measured as a function of oxygen to metal ratio (O/M) in the temperature range from 1673 to 1873 K by the gas equilibrium method using thermogravimetry. The measured oxygen potentials were analyzed by the point defect chemistry method. From this analysis, the oxygen potential of (U$$_{0.623}$$Pu$$_{0.35}$$Am$$_{0.027}$$)O$$_{2{pm}x}$$ was represented as a function of O/M ratio and temperature.

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