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Oxygen potentials of (U$$_{0.685}$$,Pu$$_{0.270}$$,Am$$_{0.045}$$)O$$_{2-x}$$ solid solutions

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逢坂 正彦  ; 佐藤 勇; 滑川 卓志; 黒崎 健*; 山中 伸介*

Osaka, Masahiko; Sato, Isamu; Namekawa, Takashi; Kurosaki, Ken*; Yamanaka, Shinsuke*

Amを含有するMOX燃料の酸素ポテンシャルを測定した。H$$_{2}$$O/H$$_{2}$$, CO$$_{2}$$/H$$_{2}$$気相平衡を用いた熱重量分析により、1123K, 1273K及び1423Kおける酸素ポテンシャルを測定した。測定値をMOX燃料と比べた場合、わずか4.5%のAmであっても酸素ポテンシャルは非常に高いことが分かった。

Oxygen potentials of (U,Pu)O$$_{2-x}$$ containing AmO$$_{2-x}$$, (U$$_{0.685}$$Pu$$_{0.270}$$Am$$_{0.045}$$)O$$_{2-x}$$, were measured as functions of the oxygen to metal (O/M) ratios and temperatures by hermogravimetric analysis (TGA) and discussed from thermodynamic viewpoints. The (U$$_{0.685}$$Pu$$_{0.270}$$Am$$_{0.045}$$)O$$_{2-x}$$ solid solution was prepared by a traditional powder metallurgical route. Oxygen partial pressure (pO$$_{2}$$) was adjusted in the region from 10$$^{-22}$$ to 10$$^{-8}$$ MPa by using CO$$_{2}$$/H$$_{2}$$ and H$$_{2}$$O /H$$_{2}$$ equilibria. Changes of microgram order in the specimen weight were continuously monitored with a TGA apparatus and the dependences of oxygen potentials on the O/M ratios were obtained at 1123K, 1273K and 1423K. The oxygen potentials of (U$$_{0.685}$$Pu$$_{0.270}$$Am$$_{0.045}$$)O$$_{2-x}$$ were significantly higher than those in (U$$_{0.7}$$Pu$$_{0.3}$$)O$$_{2-x}$$. The partial molar entropy and enthalpy of oxygen have been calculated and compared with those of Am O$$_{2-x}$$, (Am$$_{0.05}$$U$$_{0.05}$$) O$$_{2-x}$$, and (U$$_{0.7}$$Pu$$_{0.3}$$)O$$_{2-x}$$. Finally, the oxygen potential isotherms of (U$$_{0.685}$$,Pu$$_{0.270}$$,Am$$_{0.045}$$)O$$_{2-x}$$ were examined in terms of defect structure.

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パーセンタイル:78.69

分野:Chemistry, Physical

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