Effect of Grain Size of BaTiO3 Ceramics on Dielectric Properties

BaTiO3 ceramics with different grain size from 0.56 to 120 m were prepared by the conventional solid state processing and two-stage sintering method using ultrafine BaTiO3 powders prepared by a sol-gel method. Dielectric, ferroelectric and piezoelectric properties of BaTiO3 ceramics with different grain size were investigated. The grain size effect of BaTiO3 ceramics on dielectric appeared clearly. The coercive field showed a maximum value of 7.14 kV/cm at the grain size of 1.1 m and piezoelectric constant d33 showed a maximum value of 204 pC/N at 8.9 m. The remanent polarization of BaTiO3 ceramics increased with the increasing of the grain size.