Abstract
(1–x)K0.48Na0.56NbO3–xBi0.5Li0.5ZrO3 (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)K0.48Na0.56NbO3–xBi0.5Li0.5ZrO3 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 d33 = 239 pC/N, kp = 34%, and Pr = 25.23 μC/cm2 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)K0.48Na0.56NbO3–xBi0.5Li0.5ZrO3 system is a promising candidate for high-temperature piezoelectric devices.
Highlights
Piezoelectric ceramics are widely used in sensors, transducers, actuators, and surface acoustic wave devices because of their ability to convert electrical energy into mechanical energy and vice versa [1]
Abstract: (1–x)K0.48Na0.56NbO3–xBi0.5Li0.5ZrO3 (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
A high TC = 348 °C was achieved in KNN–xBLZ ceramic at x = 0.04
Summary
Piezoelectric ceramics are widely used in sensors, transducers, actuators, and surface acoustic wave devices because of their ability to convert electrical energy into mechanical energy and vice versa [1]. Abstract: (1–x)K0.48Na0.56NbO3–xBi0.5Li0.5ZrO3 (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. Our previous work [12,13] indicated that excessive Na2O which was to compensate the volatilization of Na+ could effectively improve the piezoelectric properties by 10%–40% in KNN ceramics.
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