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Phase relation of (U,Pu,Am)O$$_{2-x}$$

Osaka, Masahiko  ; Miwa, Shuhei  ; Mondo, Kenji; Ozaki, Yoko ; Ishi, Yohei; Yoshimochi, Hiroshi; Seki, Takayuki*; Sekine, Shinichi*; Ishida, Takashi*; Tanaka, Kenya

An experimental investigation for the phase relation of (U,Pu,Am)O$$_{2-x}$$ was performed with XRD, ceramography and DTA. Although lattice parameter tended to increase with increases of Am content and O/M ratio, its slope differed from that of (U,Pu)O$$_{2-x}$$. A drastic structural change was observed around O/M=1.98. Besides, many DTA peaks, which could never be seen in the case of (U,Pu)O$$_{2-x}$$, were observed above O/M=1.98.These results were interpreted with a hypothesis that all Am were trivalent and equivalent amount of U became pentavalent. The dependence of lattice parameter on Am content could be expressed well by using a model with ionic radii of each element. Also the structural change around O/M=1.98 could be explained as caused by valence states of each element. It was concluded from these interpretation that all Am in (U,Pu,Am)O$$_{2-x}$$ were likely to exist as trivalent state.

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