Piezoelectric Properties and Thermal Stability of Pb(Yb1/2Nb1/2)O3-BiScO3-PbTiO3 Ternary Ceramics

Piezoelectric ceramics with excellent piezoelectric properties and a high Curie temperature are important for numerous electromechanical devices in a broad range of temperature environments. In this work, the relaxor ferroelectric Pb(Yb1/2Nb1/2)O-3 end member was selected to be introduced into a BiScO3-PbTiO3 high-temperature piezoelectric ceramic to reduce the dielectric loss and improve the piezoelectric properties while slightly reducing the Curie temperature. The phase structure and dielectric, ferroelectric and piezoelectric properties of 0.025Pb(Yb1/2Nb1/2)O-3-(0.975--x)BiScO3-xPbTiO(3) (0.60 <= x <= 0.63) ceramics were systematically analyzed, and the best electrical properties were observed in the morphotropic phase boundary region x = 0.61 with d(33) = 370 pC/N, k(p) = 44%, P-r = 33.9 mu C/cm(2). Importantly, no significant depolarization was observed in the x = 0.61 ceramic from room temperature to 290 degrees C, demonstrating its good thermal stability and potential applications in a wide range of temperature environments.