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Formation process of BaTiO3 particles by reaction between barium hydroxide aqueous solution and titania obtained by hydrolysis of titanium alkoxide

Published online by Cambridge University Press:  31 January 2011

Min Zeng ,
Naofumi Uekawa ,
Takashi Kojima  and
Kazuyuki Kakegawa
Min Zeng
Affiliation:
Graduate School of Science and Technology, Chiba University, Inage-ku, Chiba-shi 263-8522, Japan
Naofumi Uekawa*
Affiliation:
Graduate School of Science and Technology, Chiba University, Inage-ku, Chiba-shi 263-8522, Japan; and Department of Applied Chemistry and Biotechnology, Faculty of Engineering, Chiba University, Inage-ku, Chiba-shi 263-8522, Japan
Takashi Kojima
Affiliation:
Department of Applied Chemistry and Biotechnology, Faculty of Engineering, Chiba University, Inage-ku, Chiba-shi 263-8522, Japan
Kazuyuki Kakegawa
Affiliation:
Graduate School of Science and Technology, Chiba University, Inage-ku, Chiba-shi 263-8522, Japan; and Department of Applied Chemistry and Biotechnology, Faculty of Engineering, Chiba University, Inage-ku, Chiba-shi 263-8522, Japan
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

BaTiO3 particles were prepared by heating a suspension of titania derived from the hydrolysis of titanium isopropoxide in a barium hydroxide [Ba(OH)2] aqueous solution. Well-crystallized cubic phase BaTiO3 fine particles were obtained by heating at a temperature >328 K for 24 h. The morphology and size of the obtained particles were affected by the reaction temperature and the Ba(OH)2/titanium alkoxide molar ratio. The secondary particles with a larger size were obtained at a lower reaction temperature. The nucleation process of BaTiO3 depended on the reaction temperature. The formation mechanism of BaTiO3 and the formation kinetics were investigated by measuring the concentrations of Ba2+ ions in the solution during the heating process. The BaTiO3 particle formation occurred on the surface of the titania particles after strong adsorption of the Ba2+ ions from the solution. The experimental results showed that the heterogeneous nucleation of BaTiO3 occurred on the titania surface.

Keywords

Surface chemistryHydrothermalParticulate
Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 9 , September 2007 , pp. 2631 - 2638
Copyright
Copyright © Materials Research Society 2007

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