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Published in:
01-07-2013
Reaction mechanism and kinetics analysis of the phase transformation of TiO2 from the anatase phase to the rutile phase
Published in: Journal of Materials Science: Materials in Electronics | Issue 7/2013
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Abstract
The kinetic mechanism of the phase transformation of TiO2 from the anatase phase to the rutile phase was investigated. TiO2 powders were prepared with different pH value of the starting solution via the thermal hydrolysis method in this study. The pH values of the starting solutions have significant effects on the phase transformation temperatures of the thermal hydrolysis reaction. As the reaction temperatures were raised, the conversion from the anatase phase to the rutile phase was increased. A core–shell morphology of the prepared TiO2 samples was suggested via the signals of the anatase phase and the rutile phase in UV–vis spectrum analysis. Through the isothermal heating process of the reaction kinetics, the controlling reaction in the phase transformation process from the anatase phase to the rutile phase was determined to be the three-dimensional phase boundary controlled process. The activation energy of the phase transformation was increased with an increase in the pH value of the starting solution.