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Raman study of the surface oxidation in (U, Pu)O2 as a function of Pu content

Abstract : This work presents a systematic Raman study of the matrix oxidation in a variety of (U1-y, Puy)O2 compositions (0 ≤ y ≤ 0.46) at different temperatures, between 250 DC and 400 DC. Our results indicate that the increase in Pu content hinders the oxidation process of the dioxide matrix. Further oxidation of the uranium-plutonium mixed dioxides in air starts between 250 DC and 310 DC, on a time scale of several hours. M4O9 seems to be the most stable intermediate phase formed upon oxidation of all the investigated mixed oxides, before final oxidation to M3O8. In addition, X-ray diffraction measurements and SEM images confirm the trend observed by Raman spectroscopy, i.e. Pu stabilises the fcc structure of the dioxide.
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Submitted on : Tuesday, December 17, 2019 - 11:24:10 AM
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J. Miren Elorrieta, D. Manara, L. Bonales Jimenez, Jf. Vigier, O. Dieste, et al.. Raman study of the surface oxidation in (U, Pu)O2 as a function of Pu content. Journal of Nuclear Materials, Elsevier, 2017, 495, ⟨10.1016/j.jnucmat.2017.08.043⟩. ⟨cea-02415667⟩



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