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Oxygen non-stoichiometries in (Th$$_{0.7}$$Ce$$_{0.3}$$)O$$_{2-x}$$

(Th$$_{0.7}$$Ce$$_{0.3}$$)O$$_{2-x}$$の酸素不定比

逢坂 正彦; 三輪 周平; 黒崎 健*; 宇埜 正美*; 山中 伸介*

Osaka, Masahiko; Miwa, Shuhei; Kurosaki, Ken*; Uno, Masayoshi*; Yamanaka, Shinsuke*

Ceの還元挙動の観点から(Th$$_{0.7}$$Ce$$_{0.3}$$)O$$_{2-x}$$の酸素不定比を調べた。酸素ポテンシャルの関数として、1173, 1273及び1373Kにおいて、熱重量法により酸素不定比を実験的に決定した。(Th$$_{0.7}$$Ce$$_{0.3}$$)O$$_{2-x}$$の等温曲線はアクチノイド/ランタノイド二酸化物のそれと同様の傾向を示した。(Th$$_{0.7}$$Ce$$_{0.3}$$)O$$_{2-x}$$の酸素不定比のCeO$$_{2-x}$$及び(U$$_{0.7}$$Ce$$_{0.3}$$)O$$_{2-x}$$との比較評価等を通じて、Ceの還元挙動は欠陥構造及びその変化との関係性があることがわかった。

Oxygen non-stoichiometry in (Th$$_{0.7}$$Ce$$_{0.3}$$)O$$_{2-x}$$ were investigated from a viewpoint of features of Ce reduction in several oxide solid solutions. Oxygen non-stoichiometry was experimentally determined by means of thermogravimetric analysis as a function of oxygen potential at 1173, 1273 and 1373 K. The similar features of isotherms of oxygen non-stoichiometry in (Th$$_{0.7}$$Ce$$_{0.3}$$)O$$_{2-x}$$ with those in actinide and/or lanthanide-oxygen dioxides were observed. Oxygen non-stoichiometry in (Th$$_{0.7}$$Ce$$_{0.3}$$)O$$_{2-x}$$ were compared with those of CeO$$_{2-x}$$ and (U$$_{0.7}$$Ce$$_{0.3}$$)O$$_{2-x}$$. It was concluded that features of Ce reduction have some relationships with defect forms and their transformations in the solid solutions.

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パーセンタイル:66.23

分野:Materials Science, Multidisciplinary

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