Synthesis of nc-UO2 by controlled precipitation in aqueous phase

JOURNAL OF NUCLEAR MATERIALS

卷:477

Article

Jovani-Abril, R.¹  Gibilaro, M.²  Janssen, A.¹  Eloirdi, R.¹  Somers, J.¹  Spino, J.¹  Malmbeck, R.¹ 

[1] Commiss European Communities, Inst Transuranium Elements, Joint Res Ctr, POB 2340, D-76125 Karlsruhe, Germany

[2] Univ Toulouse, UMR CNRS 5503, LGC, F-31062 Toulouse 9, France

关键词: Nanocrystals;    Aqueous synthesis;    Electrolysis;    High burn-up structure;    Nanostructure;    Ceramics;   

DOI  :  10.1016/j.jnucmat.2016.04.050

来源: Elsevier

【 摘 要 】

Nanocrystalline UO2 has been produced through controlled precipitation from an electrolytically reduced U(IV) solution. The reduction process of U(VI) to U(IV) was investigated by cyclic voltammetry in combination with absorption spectrophotometry. Precipitation was achieved by controlled alkalinisation following closely the solubility line of U(IV) in aqueous media. The highest starting concentration used was 0.5 M uranylnitrate which yielded, with the equipment used, around 10 g material pro batch. The produced nc-UO2 was characterised by transmission electron microscopy (TEM) and x-ray diffraction (XRD) and exhibited the typical UO2+x fcc fluorite structure with an average crystallite size of 3.9 nm. (C) 2016 Elsevier B.V. All rights reserved.

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