The surge of interest in searching for high-temperature piezoceramics has proved that BiScO 3 -PbTiO 3 ceramics with high piezoelectric constant and high Curie temperature are promising for high-temperature nondestructive inspection (NDT) applications. However, their inferior temperature stability limits the applications. In this paper, 0.365BiScO 3 -0.635(Pb 1-3x/2 Bi x ) (Ti 0.99 Zn 0.01 )O 3 (BS-xBPZnT) system has been investigated by doping Bi ions to A-site and Zn ions to B-site based on the lattice distortion and hybrid orbital theory. The transformation of domain structures has been achieved, which is varied from typical strip-like domains to complex configuration of microdomain. Meanwhile, the morphotropic phase boundary (MPB) was constructed in this system. The results indicated that x = 0.01 composition can reach high piezoelectric coefficient (d 33 ) of 490 pC/N and high Curie temperature of 428 • C. Besides, the in situ high-temperature d 33 results show that x = 0.01 sample can keep stable from 50 • C to 350 • C, and its depolarization temperature is 410 • C.The in situ high-temperature XRD and PFM results show that the temperature stability of phase structure and domain structure is the key factor to improve the stabilization of d 33 . This work confirms that BS-xBPZnT ceramics have superior potential for high-temperature application, paving a significant step toward enhancing the thermal stability of high-temperature piezoceramics.

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