High-temperature stability of Ba0.99Ca0.01Z0.02Ti0.98O3-doped LiTaO3 lead-free ceramics

In this work, Ba(0.99)Ca(0.01)Z(0.02)Ti(0.98)O(3)-xLiTaO(3) (x = 0, 0.05%, 0.10%, 0.15%, 0.20%, Shorthand for BCZT-xLT) lead-free piezoelectric materials were successfully prepared by high-temperature solid-state reaction method, and the ingredients were calculated according to the theoretical composition of the chemical formula. The effects of LT doping on phase structure, microstructure, dielectric properties, and piezoelectric properties of BCZT-xLT ceramics were studied. The results show that a single perovskite structure is formed after doped LT, and a small amount of LT can improve the piezoelectric and dielectric properties of BCZT. When the doping amount is 0.1%, the Curie temperature is moved to a higher temperature of 129 degrees C. In addition, the ceramics with x = 0.1% sintered at 1440 degrees C exhibit enhanced properties of the piezoelectric coefficient (d(33) similar to 361 pC/N), planar electromechanical coupling coefficient (k(p) similar to 40.8%), mechanical figure of merit (Q(m) similar to 192.4), remnant polarization (P-r similar to 16.6 mu C /cm(2)), and coercive field (E-c similar to 1.3 kV/cm).