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 °C and 400 °C. 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 °C and 310 °C, 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.
ELORRIETA Jone;
MANARA Dario;
BONALES Laura;
VIGIER Jean-Francois;
DIESTE BLANCO Oliver;
NAJI Mohamed;
BELIN R.;
BAONZA V.G.;
KONINGS Rudy;
COBOS SABATE Joaquin;
2018-01-05
ELSEVIER SCIENCE BV
JRC106959
0022-3115,
https://publications.jrc.ec.europa.eu/repository/handle/JRC106959,
10.1016/j.jnucmat.2017.08.043,
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