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Oxygen Potentials of Pultonium and Uranium Mixed Oxide

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加藤 正人   ; 田村 哲也*; 青野 茂典

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

(Pu$$_{0.3}$$U$$_{0.7}$$)O$$_{2-X}$$の酸素ポテンシャルをガス平衡法により水平差動型熱天秤を用いて測定した。800$$^{circ}C$$$$sim$$1350$$^{circ}C$$の範囲の酸素ポテンシャルのデータを取得した。得られたデータは、文献値と合わせて格子欠陥理論により整理し、温度-酸素分圧-O/Mの関係を表す式を検討した。

The oxygen potentials of (Pu$$_{0.3}$$U$$_{0.7}$$)O$$_{2-X}$$were measured by thermogravimetric equilibrium measurement in the range of the temperature from 800 to 1350 in Ar/H$$_{2}$$/H$$_{2}$$O or He/H$$_{2}$$/H$$_{2}$$O mixture gas flow. The experimental results of (Pu$$_{0.3}$$U$$_{0.7}$$)O$$_{2-X}$$are in good agree with the other works. The relationship between the partial oxygen pressure (PO$$_{2}$$) and X in MO$$_{2-X}$$ was analized based on lattice defect theory. The oxygen potential of (Pu$$_{0.3}$$U$$_{0.7}$$)O$$_{2-X}$$was modeled by lattice defect theory using the data of the literature and this work. The resulting equation well reproduces the oxygen potential-temperature data for (Pu$$_{0.3}$$U$$_{0.7}$$)O$$_{2-X}$$.

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