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Oxygen potential of (Th$$_{0.7}$$Ce$$_{0.3}$$)O$$_{2-x}$$

(Th$$_{0.7}$$Ce$$_{0.3}$$)O$$_{2-x}$$の酸素ポテンシャル

逢坂 正彦; 田中 康介; 三輪 周平; 黒崎 健*; 宇埜 正美*; 山中 伸介*

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

熱重量分析法により1173及び1273Kにおける(Th$$_{0.7}$$Ce$$_{0.3}$$)O$$_{2-x}$$の酸素ポテンシャルをO/M比の関数として実験的に決定した。(Th$$_{0.7}$$Ce$$_{0.3}$$)O$$_{2-x}$$の酸素ポテンシャルはO/M比が増加するにつれて増大し、O/M=2付近で急激な上昇が見られた。これらの特徴は蛍石構造を有する酸素不定比アクチニド二酸化物に典型的に見られるものであった。(Th$$_{0.7}$$Ce$$_{0.3}$$)O$$_{2-x}$$の酸素ポテンシャルは、Ceの平均価数に対してプロットした場合、同等な値であった。

Oxygen potentials of (Th$$_{0.7}$$Ce$$_{0.3}$$)O$$_{2-x}$$ were experimentally determined by means of thermogravimetric analysis as a function of non-stoichiometry at 1173 and 1273 K. Oxygen potentials of (Th$$_{0.7}$$Ce$$_{0.3}$$)O$$_{2-x}$$ at each temperature increased with increase of O/M ratio (= 2-x) and steep increases of the oxygen potentials toward O/M = 2 were observed. These characteristics are typical for non-stoichiometric fluorite-type actinides dioxides. The oxygen potentials of (Th$$_{0.7}$$Ce$$_{0.3}$$)O$$_{2-x}$$ were similar to those of CeOO$$_{2-x}$$ when they were plotted as a function of average Ce valence.

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