Phase characteristics of 0.92Bi0.5Na0.5TiO3-0.08BiAlO3 ceramics

The phase characteristics of 0.92Bi(0.5)Na(0.5)TiO(3)-0.08BiAlO(3) lead-free ceramics were investigated systematically. The loss tangent of poled sample shows a broad peak when heating to about 80 degrees C, i.e., depolarization temperature T-d. The polarization-electric field hysteresis loops at different temperature exhibit the feature of ferroelectric (FE)-antiferroelectric (AFE) phase transition and the co-existence of FE and AFE phase. The pyroelectric coefficients curve confirms its diffusion behaviors. The initial hysteresis loop and switching current curves under T-d indicate the co-existence of FE and AFE phase. The domain morphology of transmission electron microscopy supports the co-existence of FE and AFE phase. Our work not only exhibit that the FE and AFE phase characteristics of 0.92Bi(0.5)Na(0.5)TiO(3)-0.08BiAlO(3) ceramics but also they may be helpful for further investigation on lead-free ceramics. (C) 2015 AIP Publishing LLC.