SciELO - Scientific Electronic Library Online

vol.52 issue323Corrosion resistance of metal powders in high-carbon containing castablesDevelopment of SnO2-based varistors for high voltage application author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand




Related links



Print version ISSN 0366-6913On-line version ISSN 1678-4553


FERRAZ, W. B.  and  SABIONI, A. C. S.. Diffusion of gadolinium in the UO2 nuclear fuel. Cerâmica [online]. 2006, vol.52, n.323, pp.143-148. ISSN 0366-6913.

Bulk and grain-boundary diffusion coefficients were measured for gadolinium diffusion in UO2 nuclear fuel pellets. Between 1500 and 1703 ºC, in hydrogen atmosphere, the bulk diffusion coefficient can be described by the following Arrhenius equation: D (cm2/s) = 5,3x10-3 exp (-5,1(eV)/kT) . In the same temperature range and in the same atmosphere, the Gd grain-boundary coefficient in UO2 can be described as follows: D' d (cm3 / s) = 1,1x1,0-2 exp (-6,3 (eV) / kT), where D´ is the grain-boundary diffusion coefficient and d is the grain-boundary width. Our results show that the grain-boundary diffusion is ca. 4 orders of magnitude greater than the bulk diffusion in the same experimental conditions. Isotopic effect was not observed for the diffusion of the different gadolinium isotopes used in this work. There is no data in the literature about gadolinium diffusion in UO2 to compare to the present results.

Keywords : nuclear fuel; Gd; UO2; bulk diffusion; grain-boundary diffusion.

        · abstract in Portuguese     · text in Portuguese     · Portuguese ( pdf epdf )


Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License