Influence of BLT content on phase structure and electrical properties of (1-x)BT-xBLT ceramic

N Thongmee, R Sumang, S Pojprapai, T Klaytae


(1-x)BaTiO3-x(Bi3.25La0.75)Ti3O12; (1-x)BT-xBLT ceramics with x = 0-0.20 wt.% were prepared by a solid-state reaction method. The BaTiO3 (BT) and (Bi3.25La0.75)Ti3O12 (BLT) powders were, respectively, calcined at 1100°C and 750°C for 4 h. The (1-x)BT-xBLT samples were sintered between 1250°C and 1350°C. The structure exhibited a transformation from tetragonal to orthorhombic with increasing in BLT contents. The average grain size increased with increasing BLT contents. The maximum density and relative density about 6.19 ± 0.07 g/cm3and 99.3% were obtained for the composition of 0.95BT-0.05BLT. The Curie temperature (Tc) continuously decreased with increase in BLT contents. The dielectric constant showed a broad peak and pronounced dependence on frequency, which implied an existence of the relaxor behavior. The hysteresis parameters such as saturation polarization (Ps~18.06 mC/cm2), remanent polarization (Pr~12.64 mC/cm2) and coercive field (Ec~11.09 kV/cm) can be improved when BLT content is increased to 0.05 wt.%.

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