Lee Myang Hwan, Choi Hae In, Kim Da Jeong, Lee Sang Woo, Park Yu Bin, Yang Sang Mo, Song Tae Kwon
School of Materials Science and Engineering, Changwon National University, Changwon, Gyeongnam 51140, South Korea.
Department of Materials Convergence and System Engineering, Changwon National University, Changwon, Gyeongnam 51140, South Korea.
ACS Appl Mater Interfaces. 2025 May 21;17(20):29570-29582. doi: 10.1021/acsami.5c02859. Epub 2025 May 6.
Lead-free BiFeO-BaTiO (BF-BT) ceramics show high potential for piezoelectric sensors, actuators, and high-power transducers owing to their excellent piezoelectric properties and high Curie temperatures (). Hard piezoelectric material used in high-power transducer applications must exhibit a high mechanical quality factor (), high coercive field (), high , and low dielectric loss (tan δ). Herein, the effects of doping in BF-BT ceramics with the hard acceptor dopant Mn are investigated to enhance their hard piezoelectric properties. The 0.8Bi(FeMn)O-0.2BaTiO ( = 0, 0.005, 0.01, 0.015, and 0.02) ceramics are prepared using solid-state reaction and water-quenching processes. The increasing of the Mn content in BF-BT ceramics boosts the piezoelectric charge sensor coefficient (), , , planar piezoelectric coupling factor (), , and internal bias field (), reaching their maximum values at = 0.01 ( = 74 pC/N, = 757, = 652 °C, = 0.26, = 65 kV/cm, and = 6.2 kV/cm) with the lowest loss (tan δ = 0.009). Then, the hard piezoelectric properties deteriorate gradually with an increasing Mn content. The ferroelectric domain structure and dynamics are compared to defect-related ferroelectric and piezoelectric properties. These results show that the hard acceptor Mn in the BF-BT ceramics improves the performance of lead-free ceramics for high-power piezoelectric transducers in high-temperature environments.
无铅BiFeO-BaTiO（BF-BT）陶瓷因其优异的压电性能和高居里温度，在压电传感器、致动器和高功率换能器方面显示出巨大潜力。用于高功率换能器应用的硬压电材料必须具有高机械品质因数（）、高矫顽场（）、高 ，以及低介电损耗（tan δ）。在此，研究了用硬受主掺杂剂Mn掺杂BF-BT陶瓷对增强其硬压电性能的影响。采用固态反应和水淬工艺制备了0.8Bi(FeMn)O-0.2BaTiO（ = 0、0.005、0.01、0.015和0.02）陶瓷。BF-BT陶瓷中Mn含量的增加提高了压电电荷传感器系数（）、 、 、平面压电耦合因子（）、 ，以及内偏置场（），在 = 0.01时达到最大值（ = 74 pC/N、 = 757、 = 652 °C、 = 0.26、 = 65 kV/cm和 = 6.2 kV/cm），损耗最低（tan δ = 0.009）。然后，随着Mn含量的增加，硬压电性能逐渐恶化。将铁电畴结构和动力学与与缺陷相关的铁电和压电性能进行了比较。这些结果表明，BF-BT陶瓷中的硬受主Mn提高了无铅陶瓷在高温环境下用于高功率压电换能器的性能。
