Abstract
Lead-free piezoelectric ceramic compositions in the system: 0.99Bi0.5(Na0.82K0.18)0.5Ti(1−x)Nb x O3-0.01NaSbO3 (x = 0–0.04) were prepared by solid state reaction method. Room temperature (RT) X-ray diffraction confirmed that the crystal structure was changed from rhombohedral at x = 0 to pseudocubic symmetry with the increase of Nb-content. Polarization versus electric field (P–E) hysteresis loops displayed a decline in remnant polarization (P r ) and coercive field (E c ) The piezoelectric charge coefficient (d 33) measured was ~135 pC/N at x = 0 decreased to ~7 pC/N for the Nb-rich ceramics. A high field-induced normalized strain coefficient (S max /E max = \(d_{33}^{*}\)) of 610 pm/V was observed for the composition with 3 mol% Nb content.
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