Title: Raman study of the oxidation in (U, Pu)O2 as a function of Pu content
Authors: ELORRIETA JONEMANARA DARIOBONALES LAURAVIGIER JEAN-FRANCOISDIESTE BLANCO OLIVERNAJI MOHAMEDBELIN R.BAONZA V.G.KONINGS RUDYCOBOS SABATE JOAQUIN
Citation: JOURNAL OF NUCLEAR MATERIALS vol. 495 p. 484-491
Publisher: ELSEVIER SCIENCE BV
Publication Year: 2017
JRC N°: JRC106959
ISSN: 0022-3115
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC106959
DOI: 10.1016/j.jnucmat.2017.08.043
Type: Articles in periodicals and books
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 °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.
JRC Directorate:Nuclear Safety and Security

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