Influence of Defect Interactions on Diffusion Processes in UO 2+x : a Key Issue for Understanding the Behaviour of Spent
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Influence of Defect Interactions on Diffusion Processes in UO2+x: a Key Issue for Understanding the Behaviour of Spent Nuclear Fuel. Georgette Petot-Ervas1, Gianguido Baldinozzi1, Pascal Ruello1,2, Lionel Desgranges2, Georgeta Chirlesan1, and Claude Petot1 1 Laboratoire Structures Propriétés et Modélisation des Solides, CNRS-Ecole Centrale Paris, 92295 Châtenay-Malabry, FR, [email protected], [email protected] 2 CEA Cadarache, DEC/S3C/LECMI Bât. 316, 13108 St. Paul-lez-Durance, FR. ABSTRACT The transformation of UO2 into U3O8 is of technological and academical interest because of the severe consequences on the spent nuclear fuel management. The structural mechanism responsible for the isothermal transformation of UO2 into U3O8 seems still unclear. Several phases (UO2+x, U4O9, α-U3O7, β-U3O7, U3O8) were reported but their true structures, phase boundaries between their existence domains and matter transport processes are still a matter of debate. Gathering accurate information on the behaviour of uranium oxide is a key issue for understanding the behaviour of spent nuclear fuel. The chemical diffusion coefficient ( D˜ ) of UO2+x was determined by electrical conductivity experiments. Measurements were performed in transient state for departure from stoichiometry in the range 0
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