Conditions Extrêmes et Matériaux : Haute Température et Irradiation
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2017

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O.A.Maslova, G.Guimbretière, M.R.Ammar, L.Desgranges, C.Jégou, A.Canizarès, P.Simon, 'Raman imaging and Principal Component Analysis-Based Data Processing on Uranium Oxide Ceramics', Mater. Charact. 129 260-269 (2017) doi:10.1016/j.matchar.2017.05.015

A ceramic of uranium dioxide is probed by Raman imaging followed by a combined Lorentzian fitting – Principal Component Analysis process. This allows to evidence structural or chemical inhomogeneity of the material, which affects Raman line intensities but also line positions, which evidences local symmetry lowering. The inhomogeneities were observed not only between grain cores and boundaries, but also inside grain cores themselves. Only a part of this intensity inhomogeneity is as expected due to different orientations of the ceramic grains. Besides, a zone noticeably differing from others has been distinguished, presumably due to local strains or chemical nature (oxygen stoichiometry), showing the sensitivity of the analysis. This underlines the importance to perform Raman analysis at least on several points and better, in imaging mode, in such ceramic materials.