期刊
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
卷 12, 期 6, 页码 4724-4728出版社
AMER SCIENTIFIC PUBLISHERS
DOI: 10.1166/jnn.2012.4892
关键词
Rietveld Refinement Method; Sol-Gel; TiO2; Phase Transformation; Annealing Atmosphere
类别
资金
- University of Wollongong
- Australian Research Council (ARC) [DP1093952]
- Australian Research Council [DP1093952] Funding Source: Australian Research Council
The structural evolution of nanocrystalline TiO2 was studied by X-ray diffraction (XRD) and the Rietveld refinement method (RRM). TiO2 powders were prepared by the sol gel technique. Post annealing of as-synthesized powders in the temperature range from 500 degrees C to 800 degrees C under air and argon atmospheres led to the formation of TiO2 nanoparticles with mean crystallite size in the range of 37-165 nm, based on the Rietveld refinement results. It was found that the phase structure, composition, and crystallite size of the resulting particles were dependent on not only the annealing temperature, but also the annealing atmosphere. Rietveld refinement of the XRD data showed that annealing the powders under argon atmosphere promoted the polymorphic phase transformation from anatase to rutile. Field emission scanning electron microscopy (FESEM) was employed to investigate the morphology and size of the annealed powders.
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