05 March 2018
(1 –x)K 0.48Na 0.56NbO 3– xBi 0.5Li 0.5ZrO 3 (KNN– xBLZ, x = 0–0.06) lead-free piezoelectric ceramics were prepared by the conventional solid-state sintering method, and their phase structures and electric properties as well as were systematically investigated. The orthorhombic–tetragonal (O–T) two phases were detected in all (1 –x)K 0.48Na 0.56NbO 3– xBi 0.5Li 0.5ZrO 3 ceramics at 0.01 ≤ x ≤ 0.05. Due to the appropriate ratio between O phase and T phase ( = 45/55), high piezoelectric properties of = 239 pC/N, = 34%, and = 25.23 μC/cm 2 were obtained at x = 0.04. Moreover, a high = 348 ℃ was also achieved in KNN– xBLZ ceramic at x = 0.04. These results indicate that (1 –x)K 0.48Na 0.56NbO 3– xBi 0.5Li 0.5ZrO 3 system is a promising candidate for high-temperature piezoelectric devices.