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.