Composition‐dependent microstructure and electrical property of (1− <i>x</i> )SBN‐ <i>x</i> BNBT solid solutions

Abstract

Abstract In this study, (1− x )Sr 0.75 Ba 0.25 Nb 2 O 6 ‐ 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 in x , reaching maximum value of 10.5 at average length of 1.36 μm and diameter of 0.13 μm for x = 0.20. The maximum dielectric constant, temperature corresponding to the maximum dielectric constant, and saturated polarization decreased, respectively, from 507, 36°C, and 3.2 μC/cm 2 for x = 0 to 365, −61°C, and 2.0 μC/cm 2 fort x = 0.10, and then increased to 1167, 43°C, and 5.5 μC/cm 2 for x = 0.20. These results indicate the competitive effects of B‐site Ti 4+ and A‐site Ba 2+ on ferroelectricity.