期刊
ULTRAMICROSCOPY
卷 81, 期 3-4, 页码 263-270出版社
ELSEVIER
DOI: 10.1016/S0304-3991(99)00189-8
关键词
nanocrystalline anatase; rietveld refinement; electron powder diffraction
类别
The structure of nanocrystalline anatase (TiO2) was successfully refined from electron powder diffraction data using the Rietveld technique. A polycrystalline sample (average crystal size about 70 Angstrom) was characterised by selected area electron diffraction in a conventional transmission electron microscope operated at 300 kV. Radially integrated intensities were extracted from digitised photographic films and used in the course of structure refinements by a standard program for Rietveld analysis. The structure was refined in space group I4(1)/amd (#141) with lattice parameters a = 3.7710(9) Angstrom and c = 9.430(2) Angstrom. The reliability factors of the refinement are R-wp = 5.2% and R-B = 2.6%. The close agreement of the refined structural parameters with previous results obtained from neutron diffraction on coarse-grained powders proves the applicability of the method for characterising nanocrystalline powders. The present study shows that Rietveld analysis on electron powder data is a good compliment to the existing methods for accurate structural investigations on nanocrystalline materials and thin films. (C) 2000 Elsevier Science B.V. All rights reserved.
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