Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 344, Issue 1-2, Pages 209-214Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/S0921-5093(02)00408-2
Keywords
transformation; nanocrystalline; parameters; titaina
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Hydrous TiO2 powders were obtained from the TiCl4 precursor precipitated under different pH values by adding aqueous ammonia. The prepared titania exists in the form of nanocrystalline anatase with some brookite phase. The volume fraction of brookite phase increases with the decrease of the synthesized pH value. The beginning and ending temperature for anatase-rutile transition increases with the increase of synthesized pH value. Several parameters corresponding to the phase transformation of nanocrystalline titania, such as particle size, surface area and the polytype phase, have been discussed. The presence of brookite phase in the powders is responsible for enhancing the anatase-rutile transformation. (C) 2002 Elsevier Science B.V. All rights reserved.
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