An XPS Study of the Oxidation of Reduced Ceria-Lanthana Nanocrystals
Citation:
P. Fleming, S. Ramirez, J.D. Holmes, M.A. Morris, An XPS Study of the Oxidation of Reduced Ceria-Lanthana Nanocrystals, Chemical Physics Letters, 509, 1-3, 2011, 51-57Download Item:
Abstract:
Detailed x-ray photoelectron spectroscopy (XPS) studies on the oxidation of an extensivley cleaned, reduced ceria-lanthana solid solution (12.5 mol% La to Ce) was performed. Uptake of oxygen during oxidation followed a logarithmic dependence on exposure. Differential charging during oxidation suggests that the oxidation process is diffusion limited. No evidence for surface 3+ cerium states in the fully oxidised samples, which are anion defect free within the limits of experimental accuracy, was found. The data suggest that there is no evidence for the inherent stability of anion vacancies (associated with Ce3+ sites) at the surface of these nanocrystals.
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Grant Number
Science Foundation Ireland
07/SRC/B1155
Author's Homepage:
http://people.tcd.ie/holmesjdDescription:
PUBLISHED
Author: HOLMES, JUSTIN DEREK
Publisher:
ElsevierType of material:
Journal ArticleCollections
Series/Report no:
Chemical Physics Letters;509;
1-3;
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Physical chemistry, nanocrystalsMetadata
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