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Homogeneity of (U, $$M$$)O$$_2$$ ($$M$$ = Th, Np) prepared by supercritical hydrothermal synthesis

Shirasaki, Kenji*; Tabata, Chihiro*; Sunaga, Ayaki*; Sakai, Hironori   ; Li, D.*; Konaka, Mariko*; Yamamura, Tomoo*

We focused on the direct synthesis of (U, $$M$$)O$$_2$$ solid solution ($$M$$=Th, Np) by extending our recent progress in hydrothermal synthesis with additives. The homogeneity of the (U, $$M$$)O$$_2$$ ($$M$$ = Th, Np) systems prepared by supercritical hydrothermal reactions was investigated through crystallographic analysis based on Vegard's law, and the $$^{23}$$Na nuclear magnetic resonance (NMR) measurement of (U, Np, Na)O$$_2$$ solid solutions. Our experimental and analytical results revealed that (i) an optimal additive is ammonium carbonate and starting uranium valence is IV in the case of (U, Th)O$$_{2+x}$$, and (ii) an optimal additive is ethanol and starting uranium valence is VI in the case of (U, Np)O$$_{2+x}$$, for producing the homogeneous solid solutions by hydrothermal synthesis.

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