Multi-phase structure and electrical properties of Bi_(0.5)Li_(0.5)ZrO3 doping K_(0.48)Na_(0.56)NbO3 lead-free piezoelectric ceramics

摘要

(1-x)K_(0.48)Na_(0.56)NbO3-xBi_(0.5)Li_(0.5)ZrO3(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 Tc were systematically investigated.The orthorhombic-tetragonal(O-T)two phases were detected in all(1-x)K_(0.48)Na_(0.56)NbO3-xBi_(0.5)Li_(0.5)ZrO3 ceramics at 0.01 ≤ x ≤ 0.05.Due to the appropriate ratio between O phase and T phase(Co/CT= 45/55),high piezoelectric properties of d_(33)= 239 pC/N,kp = 34%,and Pr = 25.23 μC/cm~2 were obtained at x = 0.04.Moreover,a high Tc = 348 °C was also achieved in KNN-xBLZ ceramic at x = 0.04.These results indicate that(1-x)K_(0.48)Na_(0.56)NbO3-xBi_(0.5)Li_(0.5)ZrO3 system is a promising candidate for high-temperature piezoelectric devices.