Open AccessStructural Investigation of Uranium–Neptunium Mixed Oxides Using XRD, XANES, and 17O MAS NMR
Author(s) -
Laura Martel,
JeanFrançois Vigier,
Damien Prieur,
Sarah Nourry,
Antony Guiot,
Kathy Dardenne,
Jacobus Boshoven,
Joseph Somers
Publication year - 2014
Publication title -
the journal of physical chemistry c
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.401
H-Index - 289
eISSN - 1932-7455
pISSN - 1932-7447
DOI - 10.1021/jp507088t
Subject(s) - neptunium , xanes , uranium , actinide , chemistry , magic angle spinning , extended x ray absorption fine structure , solid state nuclear magnetic resonance , magic angle , oxidation state , analytical chemistry (journal) , nuclear chemistry , materials science , nuclear magnetic resonance spectroscopy , absorption spectroscopy , metal , solid state , nuclear magnetic resonance , spectroscopy , stereochemistry , physics , quantum mechanics , metallurgy , organic chemistry , chromatography
Uranium−neptunium mixed dioxides are considered as fuels and targets for the transmutation of the minor actinides in fast neutron reactors. Hereafter, a local and atomic scale structural analysis was performed on a series of U1−xNpxO2 (x = 0.01; 0.05; 0.20; 0.50; 0.75; 0.85) synthesized by the sol−gel external gelation method, for which longer range structural analysis indicates that the process yields solid solutions. The oxidation state of IV for uranium and neptunium cations was confirmed using U LIII and Np LIII edge X-ray absorption near edge structure (XANES). The atomic scale structure was probed with 17O magic angle spinning nuclear magnetic resonance (MAS NMR) for theanion. Structural distortions due to the substitution of U by the smaller Np cation were detected by 17O MAS NMR.JRC.E.4-Nuclear Fuel Safet
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