Effect of Mixing Condition on Sol-Gel Synthesis of Barium Titanate Ultrafine Particles.

Abstract

In the sol-gel synthesis process of barium titanate ultra-fine particles with using barium hydroxide aqueous solution and titanium alkoxide solution, the relationship between mixing condition of both solutions and the properties of particles was investigated. The static mixer was used as reactor and the mixing condition was quantitatively characterized by flow rate of solution in static mixer. Mean particle size and the width of size distribution of cubic-barium titanate ultra-fine particles were decreased with increasing flow rate, because the initial generated concentration of nucleation was increased by rapid mixture of solutions. Since the density of the hydroxyl group in a lattice of cubic barium titanate was increased with increasing flow rate, barium titanate had lattice structure of the expanded cubic perovskite.