期刊
JOURNAL OF RAMAN SPECTROSCOPY
卷 43, 期 1, 页码 76-81出版社
WILEY
DOI: 10.1002/jrs.2987
关键词
nanocrystalline CeO2; X-ray powder diffraction; Raman scattering; microstrain effects; surface mode
类别
资金
- MSTD of Serbia [ON171032, III45018]
- SASA [F-134]
- Swiss National Science Foundation [IZ73Z0-128169]
- CEEPUS [CII-AT-0038-06-1011]
Nanocrystalline ceria (CeO2) is known for its ionic conductivity and oxygen storage properties, which depend on the presence of oxygen ion vacancies. The vacancies cause several important changes in CeO2 involving microstrain, electronic structure, magnetic properties, etc. In this article, we focus our attention to the microstructural changes of nanocrystalline CeO2-x annealed at different temperatures in the range 200500 degrees C. Structural and vibrational properties were investigated by X-ray diffraction and Raman spectroscopy. It was observed that the content of oxygen vacancies changed significantly with increasing annealing temperature, which plays an important role in the observed microstructural changes of the annealed samples. We demonstrate that the observed microstrain changes, because of variable defect content, dominate over the crystallite size effect. This finding is opposite to the conclusions made by several other authors. A new mode, classified as a probable surface mode, was observed in the Raman spectra at similar to 480 cm(1), the appearance of which can be explained by the large defective structure and disorder in the ceria lattice. Copyright (c) 2011 John Wiley & Sons, Ltd.
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