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Issue 14, 2015
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In situ characterization of uranium and americium oxide solid solution formation for CRMP process: first combination of in situ XRD and XANES measurements

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Abstract

Transmutation of americium in heterogeneous mode through the use of U1−xAmxOδ ceramic pellets, also known as Americium Bearing Blankets (AmBB), has become a major research axis. Nevertheless, in order to consider future large-scale deployment, the processes involved in AmBB fabrication have to minimize fine particle dissemination, due to the presence of americium, which considerably increases the risk of contamination. New synthesis routes avoiding the use of pulverulent precursors are thus currently under development, such as the Calcined Resin Microsphere Pelletization (CRMP) process. It is based on the use of weak-acid resin (WAR) microspheres as precursors, loaded with actinide cations. After two specific calcinations under controlled atmospheres, resin microspheres are converted into oxide microspheres composed of a monophasic U1−xAmxOδ phase. Understanding the different mechanisms during thermal conversion, that lead to the release of organic matter and the formation of a solid solution, appear essential. By combining in situ techniques such as XRD and XAS, it has become possible to identify the key temperatures for oxide formation, and the corresponding oxidation states taken by uranium and americium during mineralization. This paper thus presents the first results on the mineralization of (U,Am) loaded resin microspheres into a solid solution, through in situ XAS analysis correlated with HT-XRD.

Graphical abstract: In situ characterization of uranium and americium oxide solid solution formation for CRMP process: first combination of in situ XRD and XANES measurements

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Publication details

The article was received on 16 Nov 2014, accepted on 19 Feb 2015 and first published on 25 Feb 2015


Article type: Paper
DOI: 10.1039/C4DT03515A
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Dalton Trans., 2015,44, 6391-6399

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    In situ characterization of uranium and americium oxide solid solution formation for CRMP process: first combination of in situ XRD and XANES measurements

    M. Caisso, S. Picart, R. C. Belin, F. Lebreton, P. M. Martin, K. Dardenne, J. Rothe, D. R. Neuville, T. Delahaye and A. Ayral, Dalton Trans., 2015, 44, 6391
    DOI: 10.1039/C4DT03515A

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