Conditions Extrêmes et Matériaux : Haute Température et Irradiation

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A.Devillaire, L.Desgranges, N.Tarisien, X.Iltis, C.Riglet-Martial, I.Roure, Ph.Bienvenu, A.Canizares, 'Characterization of 3000 ppm Cr2O3 doped UO2 and its precipitates', J. Raman Spectrosc. (2023) doi:10.1002/jrs.6512

The thermochemical state of UO2 based nuclear fuel is a key parameter, for which experimental data are difficult to obtain. A new experimental procedure using in-situ oxido-reduction indicators was applied to irradiated fuel, and we aim at using it with chromium doped unirradiated UO2. Nevertheless, we had first to characterise the chemical state of the chromium precipitates in our sample before. Here, we present the method we used for a statistical characterisation of these precipitates using several methods, amongst which Raman spectroscopy plays a major role. Moreover, the Raman spectra of the precipitates were interpreted as the evidence of a uranium stabilized Cr3O4 phase