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Crystallization of TiO2 in Sol-Gel Derived SiO2-TiO2 System: Formation of TiO2(B) Nanocrystallites

Published online by Cambridge University Press:  15 February 2011

T. Kogure ,
T. Umezawa ,
Y. Kotani ,
A. Matsuda ,
M. Tatsumisago  and
T. Minami
T. Kogure
Affiliation:
Mineralogical Institute, Graduate School of Science, the University of Tokyo, Tokyo 113-0033, JAPAN, kogure@min.s.u-tokyo.ac.jp
T. Umezawa
Affiliation:
Mineralogical Institute, Graduate School of Science, the University of Tokyo, Tokyo 113-0033, JAPAN, kogure@min.s.u-tokyo.ac.jp
Y. Kotani
Affiliation:
Department of Applied Material Science, Graduate School of Engineering, Osaka Prefecture University, Osaka 599-8531, JAPAN
A. Matsuda
Affiliation:
Department of Applied Material Science, Graduate School of Engineering, Osaka Prefecture University, Osaka 599-8531, JAPAN
M. Tatsumisago
Affiliation:
Department of Applied Material Science, Graduate School of Engineering, Osaka Prefecture University, Osaka 599-8531, JAPAN
T. Minami
Affiliation:
Department of Applied Material Science, Graduate School of Engineering, Osaka Prefecture University, Osaka 599-8531, JAPAN
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Abstract

The crystallization of TiO2 in monolithic SiO2-TiO2 (SiO2>TiO2) gels by annealing has been investigated. The temperatures of the crystallization of TiO2 to anatase and anatase-to-rutile phase transition were considerably raised with the addition of SiO2. It is supposed that the anatase-torutile phase transition is primarily controlled by the grain size of the crystals. TiO2(B), one of the TiO2 polymorphs, was formed as one of the first crystalline phase in SiO2-TiO2 gels at 800-900°C. Transmission electron microscope observations revealed that TiO2(B) nanocrystallites with a size of 5-10 nm were dispersed in amorphous SiO2 matrix. TiO2(B) nanocrystallites did not grow larger but transformed to anatase at higher temperatures. It is supposed that the nucleation and stability of TiO2(B) are enhanced with the presence of surrounding SiO2, presumably by a low interfacial energy.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 580: Symposium E – Nucleation & Growth Processes in Materials , 1999 , 213
Copyright
Copyright © Materials Research Society 2000

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