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Oxygen chemical diffusion coefficients of (U, Pu)O$$_{2-x}$$

(U, Pu)O$$_{2-x}$$の酸素化学拡散係数

渡部 雅; 砂押 剛雄*; 加藤 正人

Watanabe, Masashi; Sunaoshi, Takeo*; Kato, Masato

(U, Pu)O$$_{2-x}$$の酸素化学拡散係数を熱重量測定法を用いて決定した。また、酸素化学拡散係数の算出においては試料の表面反応も考慮した。その結果、酸素化学拡散係数の活性化エネルギーは、(U$$_{0.8}$$Pu$$_{0.2}$$)O$$_{2-x}$$及び(U$$_{0.7}$$Pu$$_{0.3}$$)O$$_{2-x}$$についてそれぞれ60kJ/mol, 65kJ/molとなった。

The oxygen chemical diffusion coefficient in (U, Pu)O$$_{2-x}$$ was determined by thermo-gravimetry as functions of the Pu content, oxygen-to-metal ratio and temperature. The surface reaction was considered in the diffusion coefficient determination. The activation energy for the chemical diffusion coefficient was 60 kJ/mol and 65 kJ/mol, respectively, in (U$$_{0.8}$$Pu$$_{0.2}$$)O$$_{2-x}$$ and (U$$_{0.7}$$Pu$$_{0.3}$$)O$$_{2-x}$$.

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