Enhanced piezoelectric properties of textured 70BiFeO3-30BaTiO3 based ceramics with high curie temperature
BiFeO 3 -BaTiO 3 (BF-BT)-based ceramics with large piezoelectric coefficient are potential high-performance lead-free piezoelectric compounds. In this work, BF-BT based textured ceramics were constructed through the addition of 5 vol% (001) c oriented BT templates to the 70BF-30BT matrix. The high texture degree ( F ∼96 %) and relatively enhanced piezoelectric coefficient ( d 33 = 210 pC/N) were achieved in comparison with random BF-BT ceramics. EBSD were conducted to demonstrate the feasibility of texture engineering in BF-BT-based ceramics. Unlike the tradeoff between weakened Curie temperature ( T c ) and enhanced d 33 values via the doping strategy, T c in textured BF-BT ceramics showed no significant change ( T c = 510 °C). Meanwhile, textured BF-BT ceramics had a lower coercive electric field E c = 25 kV/cm but higher spontaneous polarization P s = 55 µC/cm² and remanent polarization P r = 54 µC/cm². Such enhanced piezoelectric properties of textured ceramics were mainly attributed to the combination of piezoelectric anisotropy along the [00 l ] direction and the 4 R engineering domain configuration. This work may provide a viable direction for the realization of high-temperature piezoelectric devices.
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