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Chemical thermodynamic analysis of americium-containing UO$$_{2}$$ and (U,Pu)O$$_{2}$$

Am含有UO$$_{2}$$及び(U,Pu)O$$_{2}$$の化学熱力学法による解析

逢坂 正彦; 黒崎 健*; 山中 伸介*

Osaka, Masahiko; Kurosaki, Ken*; Yamanaka, Shinsuke*

Amを含有するUO$$_{2}$$及び(U,Pu)O$$_{2}$$の酸素ポテンシャルを、Lindemerらによって提案された化学熱力学モデルにより解析した。酸化物中のAm及びUの価数(それぞれ3価及び5価)を考慮して、Am$$_{0.8}$$O$$_{1.2}$$もしくはAm$$_{2}$$O$$_{3}$$及びAm$$_{4/3}$$U$$_{4/3}$$O$$_{16/3}$$をマスパラメータとして新規に導入した。実験値のより良い再現のために、マスパラメータの組成とその相互作用を最適化した。本解析を通じて熱力学データが得られた。実験値を本モデルにより良好に再現することができた。

Oxygen potentials of americium containing UO$$_{2}$$ and (U,Pu)O$$_{2}$$ were analyzed and represented with the chemical thermodynamic model proposed by Lindemer et al. Mass parameters were decided, considering valence states of pentavalent U and trivalent Am in the oxides; i.e., Am$$_{0.8}$$O$$_{1.2}$$ or Am$$_{2}$$O$$_{3}$$, UO$$_{2}$$, Am$$_{4/3}$$U$$_{4/3}$$O$$_{16/3}$$ and PuO$$_{2}$$. Interactions and elemental compositions for the mass parameters were optimized for better representation of the experimental data. Thermodynamic parameters were also obtained thorough the present analyses. Finally, the experimental data were successfully represented by the present model.

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パーセンタイル:31.34

分野:Chemistry, Physical

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