Preparation of Monodispersed BaTiO3 Powders by Hydrolysis of Ba/Ti Bimetallic Alkoxide
- 1 January 1992
- journal article
- Published by Ceramic Society of Japan in Journal of the Ceramic Society of Japan
- Vol. 100 (1161) , 680-684
- https://doi.org/10.2109/jcersj.100.680
Abstract
Monodispersed spherical BaTiO3 powders were prepared by hydrolysis of Ba/Ti bimetallic alkoxide, and the influences of water concentration, volume ratio of acetonitrile in the mixed solvent, aging time and hydrolysis temperature on the morphology of the BaTiO3 powders were investigated. The hydrolysis rate of Ba/Ti bimetallic alkoxide, which was prepared by refluxing titanium iso-propoxide and barium in n-octanol at 150°C in N2, was controlled in the mixed solvent of n-octanol and acetonitrile. The optimum conditions for preparing spherical BaTiO3 particles were; Ba/Ti Bimetallic alkoxide concentration 0.03mol/l, water concentration 0.2mol/l, volume ratio of acetonitrile in the mixed solvent 30vol%, aging time 1h and hydrolysis temperature 30°C. The average particle size and geometrical standard deviation of obtained particles were 0.082μm and 1.24, respectively. The obtained particles were amorphous and hydrated, which crystallized on heating at 600°C, and necks developed between particles at 1000°C.Keywords
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