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Article Dans Une Revue Journal of Nuclear Materials Année : 2017

Raman study of the surface oxidation in (U, Pu)O$_2$ as a function of Pu content

Résumé

This work presents a systematic Raman study of the matrix oxidation in a variety of (U$_{1-y}$, Pu$_y$)O$_2$ 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. M$_4$O$_9$ seems to be the most stable intermediate phase formed upon oxidation of all the investigated mixed oxides, before final oxidation to M$_3$O$_8$. 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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cea-02415667 , version 1 (24-03-2024)

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Jone Miren Elorrieta, Dario Manara, Laura Jiménez Bonales, Jean-François Vigier, Oliver Dieste, et al.. Raman study of the surface oxidation in (U, Pu)O$_2$ as a function of Pu content. Journal of Nuclear Materials, 2017, 495, pp.484-491. ⟨10.1016/j.jnucmat.2017.08.043⟩. ⟨cea-02415667⟩
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