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Synchrotron Diffraction Study of the Isothermal Oxidation of Uranium Dioxide at 250°C

Published online by Cambridge University Press:  01 February 2011

Gurvan Rousseau ,
Lionel Desgranges ,
Jean-Claude Nièpce ,
Jean-François Bérar  and
Gianguido Baldinozzi
Gurvan Rousseau
Affiliation:
SPMS, UMR 8580 CNRS-Ecole Centrale Paris, Grande voie des vignes, 92295 Châtenay-Malabry, FR. baldinozzi@spms.ecp.fr CEA Cadarache, DEC/S3C/LECMI Bât. 316, 13108 St. Paul-lez-Durance, FR. LRRS, UMR 5613, CNRS-Université de Bourgogne, 9 Av. Alain Savary BP 47870, 21078 Dijon, FR.
Lionel Desgranges
Affiliation:
CEA Cadarache, DEC/S3C/LECMI Bât. 316, 13108 St. Paul-lez-Durance, FR.
Jean-Claude Nièpce
Affiliation:
LRRS, UMR 5613, CNRS-Université de Bourgogne, 9 Av. Alain Savary BP 47870, 21078 Dijon, FR.
Jean-François Bérar
Affiliation:
D2AM CRG, CNRS, ESRF - Polygone Scientifique Louis Néel, 6 rue Jules Horowitz, 38000 Grenoble, FR.
Gianguido Baldinozzi
Affiliation:
SPMS, UMR 8580 CNRS-Ecole Centrale Paris, Grande voie des vignes, 92295 Châtenay-Malabry, FR. baldinozzi@spms.ecp.fr
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Abstract

The structural evolution of UO2 during its oxidation to U3O8 at 250°C in air was studied by in-situ synchrotron X-ray diffraction on the D2AM-CRG beamline at ESRF. The aim of this study is to determine the phases that are likely to appear during the long-term storage of spent nuclear fuel. Our results are in disagreement with the literature in which the existence of an intermediate cubic phase is not reported. Instead, an α-U3O7 tetragonal phase (c/a < 1) was mentioned but not definitively observed. These previous interpretations may have been the result of poor instrumental resolution.

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Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 802: Symposium DD – Actinides - Basic Science, Applications, and Technology , 2003 , DD1.2
Copyright
Copyright © Materials Research Society 2004

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