Effect of Grain Size of BaTiO₃Ceramics on Dielectric Properties

Abstract

Abstract BaTiO3 ceramics with different grain size from 0.56 to 120 μm 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 μm and piezoelectric constant d33 showed a maximum value of 204 pC/N at 8.9 μm. The remanent polarization of BaTiO3 ceramics increased with the increasing of the grain size. Keywords: BaTiO3 ceramicsthe grain sizeferroelectric propertiespiezoelectric constant Acknowledgments The work was supported by grant from Key Disciplinary of Materials Science under Grant No. XZD 0814-09-1, and Xi Hua university under Grant No R0620109.