Abstract
The microstructural change in the solid-state reaction of BaCO3 and TiO2 to form BaTiO3 has been investigated by using Scanning Transmission Electron Microscopy (STEM). The STEM images showed that the film of BaTiO3 formed at the surface of TiO2 particle in the first stage of this reaction. As the reaction progressed, the film thickened toward the center of TiO2 particle without forming intermediate phase such as Ba2TiO4. The influence of anion addition on the reaction rate in this solid-state reaction was also investigated. The addition of BaCl2 accelerated the formation of BaTiO3.
