Formation Mechanism of BaTiO₃ in Solid State Reaction(III)

—Activation Energy—

Abstract

The formation reaction of BaTiO₃ from BaCO₃ and TiO₂ has been interpreted as a solid phase reaction in many cases. The appearance of liquid phases were however confirmed when powder compacts containing BaCO₃ of coarse particles were heated above 950°C. It is predicted that the reaction mechanism is different, where a liquid phase participates in it or does not. Activation energies of the reaction were measured at the two stages of low and high temperatures. It was supported kinetically that the activation energy of the reaction was lowered by a participation of a liquid phase.