Preparation and ferroelectric properties of strontium barium bismuth tantalate ceramics

The preparation and ferroelectric properties of layered ferroelectric barium-doped SrBi2Ta2O9 were investigated in this study. Pure layered perovskites were successfully synthesized when the mixed reactants were heated up to 900 degrees C. The formation of solid solutions of barium-doped SrBi2Ta2O9 were confirmed. The addition of barium cations was found to substantially improve the sinterability of SrBi2Ta2O9, and resulted in densified specimens at low sintering temperatures. The degree of c-axis preferred orientation of the sintered specimens also increased with the increase in the barium content in SrBi2Ta2O9. This variation in the c-axis orientation was related to the morphological change of the gains in barium-doped SrBi2Ta2O9. The barium-doped specimens exhibited well saturated P-E loops and high remanent polarization.