期刊
SOLID STATE IONICS
卷 136, 期 -, 页码 913-920出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S0167-2738(00)00569-5
关键词
defect structure; doped CeO2; XAFS spectrometry
The local structures around Ce and Ln atoms in Ce(1-x)Ln(x)O(2-x/2)(Ln = Sc, Y, Nd, Sm, Gd, Yb, x = 0-0.30) were studied by using EXAFS (extended X-ray absorption fine structure) and XANES (X-ray absorption near edge structure) spectroscopy. The oxidation state of Ce was found to be present predominantly as the tetravalent Ce4+ cations in all Ce(1-x)Ln(x)O(2-x/2) samples. Except for the Ce-O distances in Sc-doped CeO2 showing the presence of two-phase of Sc2O3, and Ce1-xScxO2-2x/2 the Ce-O distances in Ce(1-x)Ln(x)O(2-x/2) were seen to decrease with increasing dopant concentration, suggesting that oxygen vacancies introduced by doping trivalent cations Ln to CeO2 were thought to be located around Ce ions. With dopant content, the Gd-O distances decreased but Y-O distances were seen almost constant. Several complex defect structures composed of Ce, Gd or Y and oxygen atoms were proposed. (C) 2000 Elsevier Science B.V. All rights reserved.
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