Effects of BaO-B2O3-SiO2 glass additive on densification and dielectric properties of BaTiO3 ceramics

Effects of BaO-B2O3-SiO2 glass additive on densification and dielectric properties of BaTiO3 ceramics started from hydrothermally synthesized nano-sized BaTiO3 powders (∼60 nm) were investigated. Addition of an optimal amount of the BaO-B2O3-SiO2 glass to BaTiO3 compacts accelerated densification with a limited grain growth. The sintering temperature of the BaTiO3 ceramics was lowered to 900 °C with high density above 93%. Furthermore, there was no formation of secondary phases in the sintered bodies at the optimal amount of the glass. Higher dielectric constant was obtained from the BaTiO3 ceramics with 1 wt% BaO-B2O3-SiO2 glass, sintered at 900 °C, than those observed for the pure BaTiO3 sintered at 1350 °C.