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Oxygen Potentials of Plutonium and Uranium Mixed Oxide

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加藤 正人   ; 青野 茂典; 田村 哲也*; 小無 健司*

Kato, Masato; Aono, Shigenori; Tamura, Tetsuya*; Konashi, Kenji*

30%Pu-MOXの酸素ポテンシャルを気相平衡法により熱天秤を用いて測定した。定比組成近傍のデータを温度、O/Mの関数として決定した。得られたデータは、格子欠陥理論により評価し、MO$$_{2-X}$$のXと酸素分Po$$_{2}$$は、定比組成近傍でX$$propto$$Po$$_{2}$$$$^{-1/2}$$の関係にあることを見出した。

The oxygen potentials of (Pu$$_{0.3}$$U$$_{0.7}$$)O$$_{2-X}$$ near stoichiometric region were measured by thermogravimetric technique which was used to establish the equilibrium between the oxide phases and H$$_{2}$$/H$$_{2}$$O system gas. The experimental results of (Pu$$_{0.3}$$U$$_{0.7}$$)O$$_{2-X}$$ give a consistent picture variation in Po$$_{2}$$ with O/M and the temperature with other works. The relationship between the partial oxygen pressure and X in MO$$_{2-X}$$was evaluated by the lattice defect theory. The relation in hypo-stoichiometric region is x$$mu$$Po$$_{2}$$$$^{-1/2}$$ near stoichiometric composition, and changes to x$$mu$$Po$$_{2}$$$$^{-1/3}$$ with a decrease in O/M.

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パーセンタイル:90.27

分野:Materials Science, Multidisciplinary

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