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New insight in the ...
New insight in the uranium valence state determination in UyNd1-yO2 +/- x
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- Bes, R. (författare)
- Aalto Univ, Dept Appl Phys, POB 14100, FI-00076 Aalto, Finland
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- Kvashnina, K. (författare)
- 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
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- Rossberg, A. (författare)
- 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
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- Dottavio, G. (författare)
- CEA, DEN, DEC, F-13108 St Paul Les Durance, France
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- Desgranges, L. (författare)
- CEA, DEN, DEC, F-13108 St Paul Les Durance, France
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- Pontillon, Y. (författare)
- CEA, DEN, CAD, DEC,SA3C,LAMIR, St Paul Les Durance, France
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- Solari, P. L. (författare)
- Synchrotron SOLEIL, Ligne Lumiere MARS, BP 48, F-91192 Gif Sur Yvette, France
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- Butorin, Sergei (författare)
- Uppsala universitet,Molekyl- och kondenserade materiens fysik
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- Martin, P. (författare)
- CEA, Res Dept Min & Fuel Recycling Proc, Nucl Energy Div, SFMA,LCC, Bagnols Sur Ceze, France
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(creator_code:org_t)
- ELSEVIER SCIENCE BV, 2018
- 2018
- Engelska.
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Ingår i: Journal of Nuclear Materials. - : ELSEVIER SCIENCE BV. - 0022-3115 .- 1873-4820. ; 507, s. 145-150
- Relaterad länk:
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https://hal-cea.arch...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- 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).
Ämnesord
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
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