Particle-size dependence of crystal structure of BaTiO3 powder

The particle size dependence of BaTiO3 powder was investigated from the vie wpoint of the crystal phase. The crystal phase of BaTiO3 powder was transfo rmed from tetragonal to cubic at a critical particle size of 0.1 mum at roo m temperature. With decreasing particle size, the Ba ions in the BaTiO3 str ucture were absent at the surface, and these disordered surface areas incre ased in small-particle-size BaTiO3 powders and exhibited particle-size depe ndence.