Effects of SrZrO sub(3) addition on piezoelectric properties of Bi sub(0.5)(Na sub(0.8) K sub(0.2)) sub(0.5) TiO sub(3) ceramic

(1 - x)Bi sub(0.5)(Na sub(0.8) K sub(0.2)) sub(0.5) TiO sub(3)-x SrZrO sub(3)[(1 - x)BNKT-x SZ] ceramics were synthesized by conventional solid-state reaction methods, and their ferroelectric and piezoelectric properties were investigated in this study. The X-ray powder diffraction profiles of the ceramics showed a single phase in the composition range of 0-0.07; the formation of morphotropic phase boundary between rhombohedral and tetragonal phases was suggested at compositions lower than x = 0.01. From the temperature dependence of dielectric properties, both the depolarization temperature and transition temperature from a rhombohedral phase to a tetragonal phase decreased, depending on the composition x. A pinched polarization-electric field (P-E) hysteresis loop was obtained for x= 0.005, suggesting the coexistence of ferroelectric and antiferroelectric phases. The remanent polarization and coercive field of the ceramics decreased with increasing composition x, whereas d sub(33) improved from 116 to 191 pC/N in the composition range of 0-0.005.