XAFS study on americium dioxide, americium sesquioxide and uranium-americium mixed oxide solid solution

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

We performed XAFS studies of americium dioxide (AmO $_{2}$ ), americium sesquioxide (Am $_{2}$ O $_{3}$ ) and uranium-americium mixed oxide (U $_{0.95}$ Am $_{0.05}$ O $_{2}$ ) solid solution. EXAFS results on the Am-L $_{3}$ absorption edge of AmO $_{2}$ and Am $_{2}$ O $_{3}$ were in good agreement with crystallographic data obtained from XRD analysis. In the results of XANES spectra for AmO $_{2}$ and Am $_{2}$ O $_{3}$ , an energy shift of a white line peak was observed at 4 eV, which is consistent with the chemical shift between Am $^{4+}$ and Am $^{3+}$ . The XANES result on the Am-L $_{3}$ absorption edge of U $_{0.95}$ Am $_{0.05}$ O $_{2}$ solid solution was almost in agreement with that of Am $_{2}$ O $_{3}$ . This result suggested that Am in the uranium-americium mixed oxide was in the trivalent state.

Language	:	English
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Meeting title	:	6th Workshop on Speciation, Techniques, and Facilities for Radioactive Materials at Synchrotron Light Sources and Other Quantum Beam Sources (Actinide XAS 2011)
Held date	:	2011/03
Location (city)	:	Harima
Location (country)	:	Japan
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Keywords	:	no keyword
Research Facility	:	WASTEF(廃棄物安全試験施設)
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Registration No. : BB20103213
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