Temperature independence of piezoelectric properties for high-performance BiFeO 3 -BaTiO 3 lead-free piezoelectric ceramics up to 300 °C.

The temperature-dependence behaviors of ferroelectric, piezoelectric, k p and electrical-field-induced strain were carefully evaluated for high-performance BiFeO 3 -0.3BaTiO 3 (BF-0.3BT) ceramics. There results indicate, combined with Rayleigh analysis and temperature-dependence XRD and PFM, that the increase of strain and large signal with increasing the temperature from room temperature to 180 °C is related to the joint effect of intrinsic contribution (lattice expansion) and extrinsic contribution (domain switching). With further increasing the temperature to 300 °C, the large signal d 33 and electrical-field-induced strain mildly decrease because of the increase of conductivity for BF-0.3BT ceramics. However, different from strain and large signal the small signal d 33 (E 0 ) and k p exhibit excellent temperature stability behavior as the temperature increases from room temperature to 300 °C.