Preparation of BaTiO3 Ultrafine Particles by Micro-Emulsion Charring Method

Ultrafine BaTiO3 particles were prepared by micro-emulsion charring method (MEC method). The MEC method consisted of two steps. The first steps is preparation of water/oil micro-emulsion with BaTiO3 elements. And the second is low temperature firing process in N2 atmosphere, which includes charring of oil in emulsion and powdering BaTiO3 particles with char. The char formed around BaTiO3 particles prevent an agglomeration of BaTiO3 particles during firing. In the present experiment, the W/O ratio and an amount of emulsifier greatly influenced on size of droplets of emulsion. The charring temperature was another important experimental factor in order to obtain desired BaTiO3 particles. Finally obtained BaTiO3 charring powders were monodispersed spherical particles and particle size was 0.1μm to 0.5μm.