Composition-dependent microstructure and electrical property of (1-x)SBN-xBNBT solid solutions

In this study, (1-x)Sr0.75Ba0.25Nb2O6-x[0.94Bi(0.5)Na(0.5)TiO(3)-0.06BaTiO(3)] solid solution ceramics were prepared and investigated. The length-diameter ratio of pillar-like grain increased with increase inx, reaching maximum value of 10.5 at average length of 1.36 mu m and diameter of 0.13 mu m forx = 0.20. The maximum dielectric constant, temperature corresponding to the maximum dielectric constant, and saturated polarization decreased, respectively, from 507, 36 degrees C, and 3.2 mu C/cm(2)forx = 0 to 365, -61 degrees C, and 2.0 mu C/cm(2)fortx = 0.10, and then increased to 1167, 43 degrees C, and 5.5 mu C/cm(2)forx = 0.20. These results indicate the competitive effects of B-site Ti(4+)and A-site Ba(2+)on ferroelectricity.