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|Title:||Structural Investigation of (U0.7Pu0.3)O2-x Mixed Oxides|
|Authors:||VIGIER JEAN-FRANCOIS; MARTIN Philippe; MARTEL LAURA; PRIEUR DAMIEN; Scheinost A.C.; SOMERS Joseph|
|Citation:||INORGANIC CHEMISTRY vol. 54 no. 11 p. 5358 - 5365|
|Publisher:||AMER CHEMICAL SOC|
|Type:||Articles in periodicals and books|
|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 extended X-ray absorption fine structure (EXAFS) spectroscopy is described. As observed by XRD, U0.7Pu0.3O2.00 is monophasic with a lattice parameter in good agreement with the Vegard’s law while the U0.7Pu0.3O2-x material is biphasic. Solid solution ideality in terms of a random distribution of metal atoms is proven for U0.7Pu0.3O2.00 with 17O MAS-NMR. X-ray absorption near-edge spectroscopy (XANES) confirmed the presence of plutonium (III) in U0.7Pu0.3O2-x. EXAFS investigations indicate a similar local structure around both cations, and comparison with XRD indicates a close similarity between uranium and plutonium local structures and the long range ordering.|
|JRC Directorate:||Nuclear Safety and Security|
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