Microstructures and Dielectric Properties of BaHf0.1Ti0.9O3 Ceramics Prepared Using Conventional and Microwave Sintering Methods

Barium hafnate titanate (BaHf0.1Ti0.9O3) ceramics are sintered using conventional (CS) and microwave (MS) methods. The XRD patterns show that the ceramics have a single phase perovskite structure without evidence of any additional phase. The grain size of ceramics prepared by MS is much smaller than that of the ceramics sintered by CS. It is shown that the dielectric constant of the conventionally sintered ceramics is larger than that of the microwave-sintered samples, which may be caused by the larger grain sizes of the former compared with the latter. However, the dielectric loss of the microwave-sintered BaHf0.1Ti0.9O3 ceramics is larger than that of the conventionally sintered samples. In the range of 30–140°C, there aren't obvious peaks in the dielectric constant-temperature and dielectric loss–temperature curves. It is found that the remanent polarization and coercive electric field of BaHf0.1Ti0.9O3 ceramics prepared by MS are much smaller than that obtained by CS.