A new strategy for higher Td with large and temperature-independent d33 in BNT-based piezoceramics via quenching induced built-in field

One of the key challenges in the development of eco-friendly piezoceramics is to simultaneously get large piezoelectric charge coefficient d(33) and high depolarization temperature T-d in a facile and effective manner. In this study, we demonstrated that built-in field E-b caused by simple quenching in 0.93Bi(0.5)Na(0.5)TiO(3)-0.07BaTiO(3) piezoceramic, which promoted the T-d from 140. to 184. and accompanied by the superior thermal stability of real-time d(33) (similar to 140 +/- 2.5pC/N) in a wide working temperature range of 25-170 degrees C. Structural analyses illustrated that quenching induced spontaneous phase transition from tetragonal P4bm to rhombohedral R3c, which facilitated not only the development of E-b but also the increase of field-induced R3c phase ratio, thereby strengthening the stability of field-induced ferroelectric state. Thus, our work validated a simple and effective method for designing high-performance piezoelectric materials with in-creasing T-d and temperature stability without sacrificing the large piezoelectric response. (C) 2022 Published by Elsevier B.V.