Abstract
One of the key challenges in the development of eco-friendly piezoceramics is to simultaneously get large piezoelectric charge coefficient d33 and high depolarization temperature Td in a facile and effective manner. In this study, we demonstrated that built-in field Eb caused by simple quenching in 0.93Bi0.5Na0.5TiO3-0.07BaTiO3 piezoceramic, which promoted the Td from 140 ℃ to 184 ℃ and accompanied by the superior thermal stability of real-time d33 (~140 ± 2.5pC/N) in a wide working temperature range of 25–170 ℃. Structural analyses illustrated that quenching induced spontaneous phase transition from tetragonal P4bm to rhombohedral R3c, which facilitated not only the development of Eb 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 increasing Td and temperature stability without sacrificing the large piezoelectric response.
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