Microstructure and dielectric properties of barium titanate ceramics prepared by microwave sintering

In order to improve the performance of BaTiO₃ cermics, barium titanate ceramics were prepared by microwave sintering method, using barium titanate powder synthesized by solid-state method as raw material. The samples were characterized by XRD, SEM, XPS, LCR analyzer. And the differences between the composition segregation of barium titanate ceramic particles prepared by microwave sintering and traditional sintering were also analyzed. The results show that the barium titanate ceramic particles prepared by microwave sintering are uniform in size and the Ba atom at the interface is less segregation. So the room temperature dielectric constant of barium titanate ceramic is significantly improved. The particle size of barium titanate ceramics microwave sintered at 1 100 ℃ for 2 h is about 1 μm. And its dielectric constant at room temperature at 10 kHz is 5 688, and the dielectric loss is 0.021. The section of barium titanate ceramic that has been conventional sintered at 1 250 ℃ for 2 h does not have obvious particles, which is the dielectric constant at room temperature at 10 kHz is only 3 257, and the dielectric loss is 0.021.