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Valence state of Am in (U$$_{0.95}$$Am$$_{0.05}$$)O$$_{2.0}$$

(U$$_{0.95}$$Am$$_{0.05}$$)O$$_{2.0}$$におけるAmの価数状態

西 剛史; 中田 正美; 鈴木 知史; 柴田 裕樹; 岡本 芳浩; 赤堀 光雄; 平田 勝

Nishi, Tsuyoshi; Nakada, Masami; Suzuki, Chikashi; Shibata, Hiroki; Okamoto, Yoshihiro; Akabori, Mitsuo; Hirata, Masaru

(U$$_{0.95}$$Am$$_{0.05}$$)O$$_{2.0}$$のU-L$$_{3}$$及びAm-L$$_{3}$$吸収端の透過法によるXAFS測定を行った。さらに、(U,Am)O$$_{2-x}$$中のAmの価数を明らかにするために、(U$$_{0.95}$$Am$$_{0.05}$$)O$$_{2.0}$$のAm-L$$_{3}$$のXANESスペクトルをAmO$$_{2}$$及びAm$$_{2}$$O$$_{3}$$のAm-L$$_{3}$$の吸収スペクトルを用いて検証した。(U$$_{0.95}$$Am$$_{0.05}$$)O$$_{2.0}$$におけるAm-L$$_{3}$$のXANESスペクトルはAm$$_{2}$$O$$_{3}$$のAm-L$$_{3}$$吸収スペクトルと良い一致を示したため、(U$$_{0.95}$$Am$$_{0.05}$$)O$$_{2.0}$$中のAmの価数は3価であることが明らかとなった。

The XAFS measurements at U-L$$_{3}$$ and Am-L$$_{3}$$ absorption edge of (U$$_{0.95}$$Am$$_{0.05}$$)O$$_{2.0}$$ were performed in transmission mode. Moreover, to clarify the valence state of Am in (U,Am)O$$_{2-x}$$, the XANES spectrum of Am-L$$_{3}$$ absorption edge of (U$$_{0.95}$$Am$$_{0.05}$$)O$$_{2.0}$$ was verified using those of Am-L$$_{3}$$ absorption edge of AmO$$_{2}$$ and Am$$_{2}$$O$$_{3}$$. It was found that the XANES spectrum of the Am-L$$_{3}$$ edge of (U$$_{0.95}$$Am$$_{0.05}$$)O$$_{2.0}$$ is in good accordance with that of Am$$_{2}$$O$$_{3}$$. Thus, Am in (U$$_{0.95}$$Am$$_{0.05}$$)O$$_{2.0}$$ is almost trivalent state.

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パーセンタイル:8.42

分野:Materials Science, Multidisciplinary

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