Simultaneously enhancing the Td and the thermal stability of the real‐time d33 in BNT‐based piezoceramics.

One of the inherent disadvantages of Bi0.5Na0.5TiO3‐based (BNT‐based) piezoceramics is that an increment of the depolarization temperature (Td) is generally accompanied by a deterioration of the temperature stability of the real‐time piezoelectric constant (d33), which severely restricts the practical applications of the materials. Herein, we propose a new strategy to mitigate the conflict between the elevation of Td and the temperature stability of the real‐time d33 in BNT‐based ceramics via integrating the pressure‐assisted sintering and quenching process. By this strategy, we not only increased the Td from 109 to 166°C but also improved the temperature stability of the real‐time d33 (the temperature coefficient Ttc = ± 13 pC/N) in 0.94Bi0.5Na0.5TiO3–0.06BaTiO3 ceramic. Both the built‐in field and the increment of the field‐induced R3c phase fraction play the significant role in enhancing the Td and the temperature stability of the real‐time d33. Thus, our work provides a simple and effective approach for designing piezoceramics with high Td and a superior temperature stability of the real‐time d33. [ABSTRACT FROM AUTHOR]