Sintering behavior, microstructure and dielectric performance of BaTiO3 with 60-65Â wt% addition of B2O3-Bi2O3-SiO2-ZnO glass

The sintering behaviors and characteristics of a glass-ceramic composite (BaTiO3 with 60-65 wt% addition of BBSZ) were studied in this paper. The composites showed three-stage phase generation, Bi24Si2O40 at 385-450 °C, an intermediate borate phase and Bi4Ti3O12 at 530 °C, ZnO and BaBi4Ti4O15 at 720 °C. High densification was achieved at a sintering temperature of 720 °C for the composite with BaTiO3 and 60 wt% of glass, and at 480 °C with 65 wt% glass addition. The amounts of the phases for different samples were also studied. High permittivity with a relatively low loss value (εr ∼ 116 and tan δ ∼ 0.007 at 100 kHz) was achieved when the sample having 65 wt% addition of glass was sintered at 480 °C. This sample was also feasible for co-firing with silver electrodes. With a somewhat lower glass addition (60 wt%), sintering at 720 °C generated BaBi4Ti4O15 phase showing weak ferroelectricity (remanence polarization Pr of 0.17 μC/cm2 and a coercive field Ec of 0.85 MV/m with an applied field of 8 MV/m) which also resulted in a higher loss (0.016).