Effect of mixing condition on sol-gel synthesis of barium titanate ultrafine particles

Abstract

We investigated the sol-gel synthesis process of barium titanate ultrafine particles with using barium hydroxide aqueous solution and titanium alkoxide solution. Emphasis was placed on the relationship between the mixing condition of both solutions and the properties of the particles. A static mixer was used as reactor and the mixing condition was quantitatively characterized by the f low rate of solutions in a static mixer. Mean particle size and the width of size distribution of cubic barium titanate ultrafine particles decreased with increasing f low rate, because the initial concentration of nuclei increased by rapidly mixing the solutions. Since the density of the hydroxyl group in the lattice of cubic barium titanate increased with increasing f low rate, barium titanate had a lattice structure of expanded cubic perovskite.