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1 PublicationStructural investigation of (U0.7Pu0.3)O2-x mixed oxides
Vigier, J.-F.; Martin, P. M.; Martel, L.; Prieur, D.; Scheinost, A. C.; Somers, J.
Abstract
Uranium-plutonium mixed oxide containing 30% of PuO2 is a candidate fuel for several fast neutron and accelerator driven reactor systems. In this work, a detailed structural investigation on sol-gel synthesized stoichiometric U0.7Pu0.3O2.00 and substoichiometric U0.7Pu0.3O2-x, using X-ray diffraction (XRD), oxygen 17 magic angle spinning nuclear magnetic resonance (17O MAS-NMR) and X-ray absorption spectroscopy is described. As observed by XRD, the stoichiometric U0.7Pu0.3O2.00 is monophasic with a lattice parameter in good agreement with Vegard’s law, while the substoichiometric U0.7Pu0.3O2-x material is biphasic. 17O MAS-NMR confirmed a random distribution of metal atoms and hence an ideal solid solution behaviour for U0.7Pu0.3O2.00. X-ray absorption near-edge structure (XANES) spectroscopy showed the prevalence of plutonium (III) in U0.7Pu0.3O2-x. Extended X-ray absorption fine-structure (EXAFS) spectroscopy indicated a similar local structure around U and Pu, in agreement with the long-range order determined by XRD.
Keywords: MOX; 17O MAS-NMR; XAS; XRD; uranium; plutonium
Involved research facilities
- Rossendorf Beamline at ESRF DOI: 10.1107/S1600577520014265
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DOI: 10.1021/acs.inorgchem.5b00392
Cited 33 times in Scopus
Permalink: https://www.hzdr.de/publications/Publ-21694