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

Dalton Transactions : an International Journal of Inorganic Chemistry
Marie CaissoAndré Ayral

Abstract

Transmutation of americium in heterogeneous mode through the use of U1-xAmxO2±δ 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-xAmxO2±δ 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 mineraliz...Continue Reading

References

Aug 22, 2001·Journal of Synchrotron Radiation·M Newville
Jun 22, 2005·Journal of Synchrotron Radiation·B Ravel, M Newville
Aug 23, 2012·Inorganic Chemistry·Florent LebretonPhilippe Blanchart
Nov 26, 2013·Inorganic Chemistry·Denis HorlaitThibaud Delahaye

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Citations

Oct 1, 2016·Inorganic Chemistry·Marie CaissoAndré Ayral
Aug 16, 2018·Chemical Communications : Chem Comm·Kristina O KvashninaMarc Verwerft
Mar 24, 2018·Inorganic Chemistry·Jean-François VigierRudy J M Konings
Nov 6, 2021·Journal of Synchrotron Radiation·Damien PrieurPhilippe Martin

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