Lead-free piezoelectric BiFeO3-BaTiO3 thin film with high Curie temperature

Abstract Polycrystalline 0.67Bi 1.05 FeO 3 -0.33BaTiO 3 (BF33BT) lead-free piezoelectric thin film is fabricated on Pt(111)/Ti/SiO 2 /Si(100) substrate by using pulsed laser deposition technique. The remnant polarization (2 P r ) and coercive field (2 E C ) observed from polarization hysteresis ( P - E ) loop are 18 μC/cm 2 and 208 kV/cm, respectively. The local piezoelectric constant ( d 33,PFM ) of BF33BT thin film is 92.5 pm/V which is as high as lead-based piezoelectric thin film results. From the temperature dependent dielectric constant result, the Curie temperature is 405 °C. These results show that BF33BT thin film is a promising candidate for lead-free piezoelectric nano- and micro-devices with high Curie temperature.