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RESEARCH PRODUCT
Synthesis and characterization of nanometric powders of UO2+x, (Th,U)O2+x and (La,U)O2+x
G. RousseauBernd GrambowMassoud FattahiGuy OuvrardNadine MillotJean-claude NiepceLionel DesgrangesFlorent Bouchersubject
Materials scienceAnalytical chemistry02 engineering and technology010402 general chemistry01 natural sciencesElectron spectroscopyInorganic Chemistrychemistry.chemical_compoundX-ray photoelectron spectroscopyMaterials ChemistryUranium oxidePhysical and Theoretical ChemistryHigh-resolution transmission electron microscopyPrecipitation (chemistry)021001 nanoscience & nanotechnologyCondensed Matter Physics0104 chemical sciencesElectronic Optical and Magnetic MaterialschemistryTransmission electron microscopyX-ray crystallographyCeramics and Composites[PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci]Crystallite0210 nano-technologyNuclear chemistrydescription
This paper describes a new way of preparing nanometric powders of uranium oxide, to fit the needs of studies on UO{sub 2} oxidation, through the electrochemical reduction of U(VI) into U(IV). These powders can also be doped with radionuclides if necessary. The precipitation of oxides occurs in reducing and anoxic conditions. This original method makes it possible to synthesize nanometric UO{sub 2} powders with a calibrated size, as well as the Th- and La-doped UO{sub 2} powders with a predefined composition. The powder characterization by the X-ray diffraction, X-ray photoelectron spectroscopy and transmission electron Microscopy shows the formation of spherical crystallites of UO{sub 2+x}, (Th,U)O{sub 2+x} and (La,U)O{sub 2+x} phases. The composition can be defined by the initial Th/(Th+U) and La/(La+U) ratios in solution and the particle size can be controlled by varying the pH. - Abstract: High-resolution transmission electron microscopy (HRTEM) observation of UO2+x powders obtained at a pH=6.5. Display Omitted
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2009-10-01 |