Achieving both large piezoelectric constant and low dielectric loss in BiScO3-PbTiO3-Bi(Mn2/3Sb1/3)O3 high-temperature piezoelectric ceramics

BiScO3-PbTiO3 binary ceramics own both high Curie temperature and prominent piezoelectric properties, while the high dielectric loss needs to be reduced substantially for practical application especially at high temperatures. In this work, a ternary perovskite system of (1-x-y)BiScO3-yPbTiO(3)-xBi(Mn2/3Sb1/3)O-3 (BS-yPT-xBMS) with x= 0.005, y= 0.630-0.645 and x= 0.015, y= 0.625-0.640 was prepared by the traditional solid-state reaction method. The phase structure, microstructure, dielectric/piezoelectric/ferroelectric properties were studied. Among BS-yPT-xBMS ceramic series, the BS-0.630PT-0.015BMS at morphotropic phase boundary possesses the reduced dielectric loss factor (tan delta = 1.20%) and increased mechanical quality factor (Q(m) = 84), and maintains a high Curie temperature (T-C = 410 degrees C) and excellent piezoelectric properties (d(33)= 330 pC/N) simultaneously. Of particular importance, at elevated temperature of 200 degrees C, the value of tan delta is only increased to 1.59%. All these properties indicate that the BS-0.630PT-0.015BMS ceramic has great potential for application in high-temperature piezoelectric devices.