首页|Homogeneity of (U, M)O-2 (M = Th, Np) prepared by supercritical hydrothermal synthesis
Homogeneity of (U, M)O-2 (M = Th, Np) prepared by supercritical hydrothermal synthesis
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NSTL
Elsevier
The management of neptunium, an artificial element produced in nuclear reactors that is unsuitable for recycled fuel, is crucial for the development of long-term toxicity reduction. In this study, 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 23Na nuclear magnetc 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. (c) 2022 Elsevier B.V. All rights reserved.
NSTL
Elsevier
