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

JOURNAL OF NUCLEAR MATERIALS

卷:495

Article

Elorrieta, J. M.¹  Manara, D.²  Bonales, L. J.¹  Vigier, J. F.²  Dieste, O.²  Naji, M.²  Belin, R. C.³  Baonza, V. G.⁴  Konings, R. J. M.²  Cobos, J.¹ 

[1] CIEMAT, Ctr Invest Energet Medioambientales & Tecnol, Ave Complutense 40, Madrid 28040, Spain

[2] European Commiss, JRC, Postfach 2340, D-76125 Karlsruhe, Germany

[3] CEA, DEN, DEC, SESC,LLCC, F-13108 St Paul Les Durance, France

[4] Univ Complutense, MALTA Consolider Team, Dept Quim & Fis 1, Fac Ciencias Quim, E-28040 Madrid, Spain

关键词: Interim storage;    Nuclear waste;    Uranium-plutonium mixed oxides;    Raman spectroscopy;    Oxidation;   

DOI  :  10.1016/j.jnucmat.2017.08.043

来源: Elsevier

【 摘 要 】

This work presents a systematic Raman study of the matrix oxidation in a variety of (U1-y, Pu-y) O-2 compositions (0 <= y <= 0.46) at different temperatures, between 250 degrees C and 400 degrees 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 degrees C and 310 degrees 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. (C) 2017 Elsevier B.V. All rights reserved.

【 授权许可】

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