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New insight in the uranium valence state determination in UyNd1-yO2 +/- x
Aalto Univ, Dept Appl Phys, POB 14100, FI-00076 Aalto, Finland.
ESRF European Synchrotron, Rossendorf Beamline, CS40220, F-38043 Grenoble 9, France;Helmholtz Zentrum Dresden Rossendorf HZDR, Inst Resource Ecol, POB 510119, D-01314 Dresden, Germany.
ESRF European Synchrotron, Rossendorf Beamline, CS40220, F-38043 Grenoble 9, France;Helmholtz Zentrum Dresden Rossendorf HZDR, Inst Resource Ecol, POB 510119, D-01314 Dresden, Germany.
CEA, DEN, DEC, F-13108 St Paul Les Durance, France.
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2018 (English)In: Journal of Nuclear Materials, ISSN 0022-3115, E-ISSN 1873-4820, Vol. 507, p. 145-150Article in journal (Refereed) Published
Abstract [en]

The charge compensation mechanisms in UyNd1-yO2 +/- x, and its consequence on the overall O stoichiometry (or O/M ratio where M = Nd + U) have been studied through the uranium valence state mixture evolution as a function of Nd content up to y = 0.62 by means of high energy resolution fluorescence detection X-ray absorption spectroscopy (HERFD-XAS) at the U M-4-edge. Our results clearly demonstrate the formation of U5+ at low Nd content (y < 0.15). Upon increasing the Nd content, oxygen vacancies and the formation of U6+ appear as competing mechanisms for intermediate Nd concentrations, leading to the co-existence of U4+/U5+/U6+ mixed valence and an overall hypostoichiometry (O/M < 2.00). Finally, the formation of U6+ associated with strongly distorted U local environment is observed for high Nd concentrations (y = 0.62), leading to an overall hyperstoichiometry (O/M < 2.00).

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV , 2018. Vol. 507, p. 145-150
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-361029DOI: 10.1016/j.jnucmat.2018.04.046ISI: 000438019800017OAI: oai:DiVA.org:uu-361029DiVA, id: diva2:1249886
Funder
Swedish Research Council, 2017-06465Available from: 2018-09-20 Created: 2018-09-20 Last updated: 2018-09-20Bibliographically approved

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Butorin, Sergei

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