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Oxygen potential measurement of U$$_{0.85}$$Am$$_{0.15}$$O$$_{2}$$ at 1473, 1573, and 1673 K

1473, 1573及び1673 KにおけるU$$_{0.85}$$Am$$_{0.15}$$O$$_{2}$$の酸素ポテンシャル測定

渡部 雅  ; 横山 佳祐 ; Vauchy, R.  ; 加藤 正人   ; 菅田 博正*; 関 崇行*; 日野 哲士*

Watanabe, Masashi; Yokoyama, Keisuke; Vauchy, R.; Kato, Masato; Sugata, Hiromasa*; Seki, Takayuki*; Hino, Tetsushi*

本研究では熱重量法を用いて1473、1573及び1673KにおけるU$$_{0.85}$$Am$$_{0.15}$$O$$_{2-x}$$の新たな酸素ポテンシャルデータを取得した。同じy及びO/M比で比較した場合、U$$_{1-y}$$Am$$_{y}$$O$$_{2-x}$$の酸素ポテンシャルは、U$$_{1-y}$$Pu$$_{y}$$O$$_{2-x}$$よりも高いことがわかった。また、hypostoichiometric領域のカチオン価数はNd含有UO$$_{2}$$と類似しており、定比組成では、Am$$^{3+}$$, U$$^{4+}$$, and U$$^{5+}$$となると推定された。実験データを欠陥化学モデルを用いて解析し、O/M比を温度と酸素分圧の関数として表すことができた。

Oxygen potential data of U$$_{0.85}$$Am$$_{0.15}$$O$$_{2-x}$$ were measured at 1473, 1573, and 1673 K by thermogravimetry. In U$$_{1-y}$$An$$_{y}$$O$$_{2-x}$$, where An stands for Pu or Am, and for a given value of y and Oxygen/Metal ratio, the oxygen potential of U$$_{1-y}$$Am$$_{y}$$O$$_{2-x}$$ is higher than that of U$$_{1-y}$$Pu$$_{y}$$O$$_{2-x}$$. The valence of cations in the hypostoichiometric region is similar to that of Nd-doped UO$$_{2}$$. At the stoichiometric composition, it is estimated to be Am$$^{3+}$$, U$$^{4+}$$, and U$$^{5+}$$ (for charge compensation of Am$$^{3+}$$). The experimental data were analyzed using a defect chemistry model, and a relationship connecting the oxygen-to-metal ratio, the temperature, and the equilibrium oxygen partial pressure was proposed.

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パーセンタイル:86.32

分野:Materials Science, Multidisciplinary

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