作者
AEC Palmqvist, M Wirde, U Gelius, M Muhammed
发表日期
1999/11/1
期刊
Nanostructured Materials
卷号
11
期号
8
页码范围
995-1007
出版商
Pergamon
简介
Solid solutions of nanophase cerium oxides have been prepared and the relationship between their bulk crystal structure and surface characteristics has been studied at room temperature with X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Dopants with a valence lower than +4, such as Ca2+, Nd3+, and Pb2+, introduce structural defects (oxygen vacancies) in the cerium oxide lattice, which has been found to affect the redox catalytic activity of the materials. The introduction of oxygen vacancies leads to the appearance of an O1s core level peak with a shift of 2.0–2.5 eV to higher binding energies as compared to the core level peak of the lattice oxygen in CeO2. The intensity of this high binding energy O1s peak varies with the expected concentration of oxygen vacancies in the surface, the type of dopant cation and its concentration in the solid solution. It was found that carbonate and hydroxide …
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AEC Palmqvist, M Wirde, U Gelius, M Muhammed - Nanostructured Materials, 1999