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Formation mechanism of fine anatase crystals from amorphous titania under hydrothermal conditions

Published online by Cambridge University Press:  31 January 2011

Kazumichi Yanagisawa ,
Yuichi Yamamoto ,
Qi Feng  and
Nakamichi Yamasaki
Kazumichi Yanagisawa
Affiliation:
Research Laboratory of Hydrothermal Chemistry, Faculty of Science, Kochi University, Kochi 780, Japan
Yuichi Yamamoto
Affiliation:
Research Laboratory of Hydrothermal Chemistry, Faculty of Science, Kochi University, Kochi 780, Japan
Qi Feng
Affiliation:
Research Laboratory of Hydrothermal Chemistry, Faculty of Science, Kochi University, Kochi 780, Japan
Nakamichi Yamasaki
Affiliation:
Research Laboratory of Hydrothermal Chemistry, Faculty of Science, Kochi University, Kochi 780, Japan
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Abstract

Crystallization of amorphous titania prepared by hydrolysis of ethoxide was accelerated even by a small amount of water in the vapor phase. The existence of water promoted the change of localized structure of the amorphous titania to anatase structure, which resulted in acceleration of anatase nucleation. The anatase crystals grew in steam by solid-state epitaxial growth, but stopped growing in a short time. The growth of anatase crystals under hydrothermal conditions could be divided into the following two stages: the first stage with fast growth rate by the solid-state epitaxial growth and the second stage with slow growth rate by the dissolution and deposition process.

Type
Articles
Information
Journal of Materials Research , Volume 13 , Issue 4 , April 1998 , pp. 825 - 829
Copyright
Copyright © Materials Research Society 1998

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References

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