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Dielectric Properties and Low-Temperature Sintering of the Ba0.6Sr0.4TiO3 Ceramics with B2O3/CuO Additions



The sintering behaviors and dielectric properties of Ba0.6Sr0.4TiO3 ceramics were investigated as a function of B2O3 and CuO content. The addition of both B2O3 and CuO reduced the sintering temperature of Ba0.6Sr0.4TiO3 about 500°C. It was suggested that a liquid phase BaCu(B2O5) was formed and assisted the densification of Ba0.6Sr0.4TiO3 ceramics. Ba0.6Sr0.4TiO3 ceramics co-doped with 3.0 mol% B2O3, and 2.0 mol% CuO, sintered at 950°C for 5 h, had a dense microstructure and showed good microwave dielectric properties of a moderate dielectric constant (ε = 1048), low dielectric loss (0.0090) and high tunability (42.2%) at dc electric field of 30 kV/cm.