Superior piezoelectric performance with high operating temperature in bismuth ferrite-based ternary ceramics

Due to the thermal depolarization effect, adequate piezoelectric performance with high operating tem-perature is regarded to be challenging to accomplish concurrently in piezoceramics for applications in specific piezoelectric devices. In this work, we synthesized (0.8 -x)BiFeO3- xPbTiO3-0.2Ba(Zr0.25Ti0.75)O3 (abbreviated as BFO-xPT-BZT) ternary solid solutions with 0.15 & LE; x & LE; 0.30 by conventional solid-state reaction method. The MPB composition with a coexisting state of rhombohedral-tetragonal phases ex-hibits enhanced electromechanical properties, including Curie temperature of 380 & DEG;C, large-signal equiv-alent piezoelectric coefficient d*33 of 395 pm V -1 , small-signal piezoelectric coefficient d 33 of 302 pC N -1 , and electromechanical coupling factor kp of 50.2%, which is comparable to commercial PZT-5A ceramics, indicating potential in high-temperature applications. Furthermore, in -situ X-ray diffraction (XRD) and piezoelectric force microscopic (PFM) techniques demonstrate that multiphase coexistence and complex nanodomains promote piezoelectric response via synergism. The x = 0.24 composition exhibits the high -est in -situ d 33 of 577 pC N -1 and good temperature stability in 30 -280 & DEG;C, indicating that BZT-modified BFO-PT ceramics are promising candidates for high-temperature piezoelectric devices.& COPY; 2023 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.