Ba-Ti複合アルコキシドの加水分解による単分散BaTiO_3微粒子の合成

概要

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Monodispersed spherical BaTiO_3 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 BaTiO_3 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℃ in N_2, was controlled in the mixed solvent of n-octanol and acetonitrile. The optimum conditions for preparing spherical BaTiO_3 particles were; Ba/Ti bimetallic alkoxide concentration 0.03 mol/l, water concentration 0.2 mol/l, volume ratio of acetonitrile in the mixed solvent 30 vol%, aging time 1 h and hydrolysis temperature 30℃. The average particle size and geometrical standard deviation of obtained particles were 0.082 μm and 1.24, respectively. The obtained particles were amorphous and hydrated, which crystallized on heating at 600℃, and necks developed between particles at 1000℃.
社団法人日本セラミックス協会の論文
1992-05-01