Synthesis reaction of metatitanate BaTiO₃

Abstract

The macroscopic reproduction of the various solid-solid interfaces expected in the synthesis of BaTiO₃ from BaCO₃ and TiO₂ enabled us to describe the reaction stages in visualizing the diffusion of the entities concerned as well as the domains undergoing transformation. The following results were established or confirmed, (a) Firstly, metatitanate BaTiO₃ forms at the expense of TiO₂ by diffusion of barium from BaCO₃. (b) Secondly, orthotitanate Ba₂TiO₄ forms at the expense of the BaTiO₃ layer by diffusion of barium from BaCO₃. (c) Finally, the orthotitanate is converted into BaTiO₃ releasing an unidentified species of BaO stoichiometry which diffuses towards TiO₂ through BaTiO₃ to form BaTiO₃.