Preparation and dielectric properties of B2O3-Li2O-doped BaZr0.35Ti0.65O3 ceramics sintered at a low temperature

BaZr0.35Ti0.65O3 (BZT) ceramics were fabricated by a traditional ceramic process at a relatively low sintering temperature using liquid-phase sintering aids B2O3 and Li2O. The dielectric properties of BZT ceramics were investigated with the emphasis placed on the dielectric properties under an applied dc electric field. The temperature-dependent dielectric constant revealed that the pure BZT and B2O3-Li2O-doped BZT ceramics all had a typical relaxor behaviour and diffuse phase transition characteristics. The temperature-dependent dielectric constant under the applied dc electric field showed that the Curie temperature was slightly shifted to higher temperature and the peaks were suppressed and broadened. The dielectric loss was still < 0.005 and tunability was > 20% at an applied dc electric field of 30 kV/cm. 13 refs.