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Synthesis and characterization of nanometric powders of UO2+x, (Th,U)O2+x and (La,U)O2+x |
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| Authors: | G. Rousseau,M. Fattahi,L. Desgranges,G. Ouvrard,J.C. Niè pce |
| Affiliation: | a Ecole des Mines de Nantes, SUBATECH, UMR 6457, 4, rue Alfred Kastler, BP 20722, 44307 Nantes, France b CEA Cadarache, DEN/DEC/SA3C/L2EC, Bât. 315, 13108 Saint-Paul-les-Durance, France c Institut des Matériaux Jean Rouxel, UMR 6502, 2, rue de la Houssinière, BP 32229, 44322 Nantes, France d Institut Carnot de Bourgogne, UMR 5209 CNRS/Université de Bourgogne, 9 Avenue Alain Savary, BP 47870, 21078 Dijon cedex, France |
| Abstract: | This paper describes a new way of preparing nanometric powders of uranium oxide, to fit the needs of studies on UO2 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 UO2 powders with a calibrated size, as well as the Th- and La-doped UO2 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 UO2+x, (Th,U)O2+x and (La,U)O2+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. |
| Keywords: | Precipitation Electrochemical reduction Nanometric particles UO2 Powders characterization |
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