Outstanding piezoelectric performance of BiScO3-PbTiO3-based ceramics over a wide high-temperature region

Piezoceramics with high piezoelectric performance in a wide elevated temperature range are the best potential stocks used in advanced high-temperature piezoelectric devices. Here, novel ternary perovskite piezoceramics of (0.997-x)BiScO3-xPbTiO3-0.003Bi(Zn2/3Nb1/3)O3 (BS-xPT-BZN) are synthesized and investigated. The morphotropic phase boundary (MPB) composition of the BS-xPT-BZN system is located at x = 0.625, which exhibits a high Curie temperature (TC) of 442 degrees C. More excitingly, the in-situ piezoelectric coefficient (d33) of the x = 0.625 MPB sample is not only as high as 558 pC/N at 200 degrees C, but also has a fluctuation rate of less than & PLUSMN; 10 % in the ultra-wide high-temperature range of 100 - 308 degrees C. The above excellent comprehensive high-temperature piezoelectric performance should be attributed to the synergistic effect of composition-related MPB and dispersion characteristics and thermally stable ferroelectric domain state. The results demonstrate that BS-xPTBZN ceramics can be used as very competitive perovskite piezoelectrics to construct piezoelectric devices for applications in harsh high-temperature environments.