Study on Dielectric Properties of SiO2-doped BaTiO3 Ceramics

(1-x)BaTiO3-xSiO2 (x = 0, 0.2, 0.4, 0.6, 0.8 and 1.0 mol%) ceramics were prepared by microwave sintering method, which nanopowders of BaTiO3 and SiO2 were successfully synthetized by conventional hydrothermal method and Stober method, respectively. The effect of SiO2 content on microstructure and dielectric properties was investigated. X-ray diffraction result suggested that tetragonality (c/a) of the samples increased with increasing content of SiO2. It was found that there existed an increase in density and grain size of the samples for x≤0.4, which was mainly attributed to the presence of liquid phase during sintering process. BaTiO3 ceramics containing such amount of SiO2 also showed improved dielectric properties.