A Density Functional Study of Oxygen Mobility in Ceria-Based Materials

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In CeO2-based solid electrolytes, it has been shown that point defects are directly responsible for oxygen ionic conduction. The ionic conductivity is strongly affected by the anion vacancy concentration which is enhanced by doping with aliovalent cations. When rare earth sesquioxides such as La2O3, Gd2O3, Sm2O3, Y2O3 are added to CeO2, the dopant cation substitutes for the cerium ion, and oxygen vacancies are created for charge compensation. Incorporation of trivalent dopants into CeO2 at the Ce4+ sites can be depicted by the following defect reaction (expressed in Kröger-Vink notation):

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Periodical:

Defect and Diffusion Forum (Volumes 323-325)

Edited by:

I. Bezverkhyy, S. Chevalier and O. Politano

Pages:

233-238

Citation:

C. Frayret et al., "A Density Functional Study of Oxygen Mobility in Ceria-Based Materials", Defect and Diffusion Forum, Vols. 323-325, pp. 233-238, 2012

Online since:

April 2012

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$38.00

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