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Structural transformation of nanocrystalline titania grown by sol-gel technique and the growth kinetics of crystallites

Hu Lin-Hua Dai Song-Yuan Wang Kong-Jia

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Structural transformation of nanocrystalline titania grown by sol-gel technique and the growth kinetics of crystallites

Hu Lin-Hua, Dai Song-Yuan, Wang Kong-Jia
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  • Structural transformation of nanocrystalline titania prepared by sol_gel method with hydrolysis precursor titanium isopropoxide was investigated. At the same ti me, the growth kinetics of titania powders was also studied. It was found that t he grain size of the powders increased slowly with autoclave heating temperature up to 503K, when hydrolysis pH value was 0.9, but grew rapidly when heating tem perature was higher than 503K. The activation energies for growth of anatase cry stallites in two temperature regions were calculated to be 18.5kJ/mol and 59.7 k J/mol respectively. The x_ray diffraction results show that the transformation f rom anatase phase to rutile phase starts at 503K and structural transformation f inished when temperature raises to 543K, which is a temperature much lower than that of the transformation reported in the literature.
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Publishing process
  • Received Date:  20 September 2002
  • Accepted Date:  14 January 2003
  • Published Online:  20 September 2003

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