Point defects and oxygen diffusion in fluorite type oxides

We present thermodynamic models of point defects formation in fluorite-type oxides with important technological applications, such as hypostoichiometric ceria CeO2-x and plutonia PuO2-x. The concentrations of defect species were calculated at different temperatures and partial pressures of oxygen. T...

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Bibliographic Details
Published in:Journal of Optoelectronics and Advanced Materials 2007-06, Vol.9 (6), p.1750-1756
Main Authors: Cristea, P, Stan, M, Ramirez, J C
Format: Article
Language:English
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Summary:We present thermodynamic models of point defects formation in fluorite-type oxides with important technological applications, such as hypostoichiometric ceria CeO2-x and plutonia PuO2-x. The concentrations of defect species were calculated at different temperatures and partial pressures of oxygen. To highlight some of the current capabilities of the approach, a number of example applications, including the calculation of defect configuration entropy, and the calculation of self and chemical diffusivities of oxygen as a function of nonstoichiometry and temperature are addressed. The results provided by the modeling are validated against available experimental data on non-stoichiometry and oxygen diffusivity.
ISSN:1454-4164