Electrical properties and microstructure of phase combination in BaTiO 3 -based Ceramics

Abstract

Perovskite barium titanate (BaTiO 3 ) ceramics are widely used in electronics industries such as capacitors, sensors and actuators. BaTiO 3 -based ceramics have good dielectric, ferroelectric and piezoelectric properties. BaTiO 3 powder was fabricated by mixed-oxide method via a vibro-milling technique. The pellets were then placed in a high purity alumina crucible in air and sintered at 1375 °C for 1, 2, 4, 6 and 8h. X-ray diffraction technique was used to investigate phase formation of BaTiO3 ceramics. Grain size was measured by scanning electron microscopy (SEM). The computer-controlled dielectric measurement system consisted of a high precision LCR-meter. Electric field induced polarization was measured by Sawyer-Tower circuit. In this work, the effect of phase combination in BaTiO 3 ceramics on electrical properties (dielectric and electric field induced polarization) and microstructure was investigated.