Title: On the Role of the Electrical Field in Spark Plasma Sintering of UO2+x
Authors: TYRPEKL VACLAVNAJI MOHAMEDHOLZHAEUSER MICHAELFREIS DANIELPRIEUR DAMIENMARTIN PHILIPPECREMER BERTMURRAY FARTHING MAIREADCOLOGNA MARCO
Citation: SCIENTIFIC REPORTS vol. 7 p. 46625
Publisher: NATURE PUBLISHING GROUP
Publication Year: 2017
JRC N°: JRC104118
ISSN: 2045-2322
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC104118
DOI: 10.1038/srep46625
Type: Articles in periodicals and books
Abstract: The electric field has a large effect on the stoichiometry and grain growth of UO2+x during Spark Plasma Sintering. UO2+x is gradually reduced to UO2.00 as a function of sintering temperature and time. A gradient in the oxidation state within the pellets is observed in intermediate conditions. The shape of the gradient depends unequivocally on the direction of the electrical field. The positive surface of the pellet shows a higher oxidation state compared to the negative one. An area with larger grain size is found close to the positive electrode, but not in contact with it. We interpret these findings with the redistribution of defects under an electric field, which affect the stoichiometry of UO2+x and thus the cation diffusivity. The results bear implications for understanding the electric field assisted sintering of UO2 and non-stoichiometric oxides in general.
JRC Directorate:Nuclear Safety and Security

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