Abstract
The effect of SiO2 on the electrical conductivities of BaTiO3 was studied. From 0.5 to 3.5wt% of SiO2 was added to BaTiO3, and the mixture was sintered at 1300°C for one hour. Specimens containing 0.5 to 3.0wt% SiO2 had an average grain diameter of 30μm and the electrical conductivity of 10-2S/m at room temperature, and showed PTC effect. On the other hand, specimens containing 3.5wt% SiO2 had an average grain diameter of 3μm and low electrical conductivity of 10-11S/m at room temperature, and did not show PTC effect. Thus, electrical properties depend on the SiO2 content, and these experimental results were explained by changes in the average grain diameter of the sintered BaTiO3.
