Yang Xinlin, Fang Bijun, Zhang Shuai, Lu Xiaolong, Ding Jianning
School of Materials Science and Engineering, Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, State Key Laboratory of Photovoltaic Science and Technology, National Experimental Demonstration Center for Materials Science and Engineering, Changzhou University, Changzhou 213164, China.
School of Mechanical Engineering, Yangzhou University, Yangzhou 225127, China.
Materials (Basel). 2025 Apr 21;18(8):1888. doi: 10.3390/ma18081888.
In order to reduce the sintering temperature, MnO was used as a sintering aid to prepare (BaCa)(DyTb)O-x mol% MnO (BCDTZT-x mol% MnO, x = 0.05, 0.2, 0.4, 0.6, 0.8, 1, 1.5, 3) lead-free piezoelectric ceramics in which the effects of the MnO doping amount and sintering temperature on the phase structure, sintering behavior, and electrical properties of the BCDTZT-x mol% MnO ceramics were systematically analyzed. All ceramics have a single perovskite structure and coexist in multiple phases. The optimal sintering temperature was reduced from 1515 °C to 1425 °C, and the density of all ceramics was increased as compared with the undoped ceramic, reaching a maximum of 5.38 g/cm at x = 0.8 mol%. An appropriate MnO doping amount of 0.4 mol% could effectively suppress oxygen vacancies and improve electrical properties, resulting in the best comprehensive performance of the ceramics, with a dielectric constant maximum of 12,817, a high piezoelectric constant of 330 pC/N, and good strain value (S = 0.118%) and low strain hysteresis (Hys = 2.66%). The calculation of activation energy indicated that the high-temperature conductivity was dominated by oxygen vacancies in all ceramics. The results showed that the appropriate introduction of MnO as a sintering aid could improve the performance of BCZT-based ceramics while reducing the sintering temperature, presenting high practical application value in the fields of low electric field sensors and actuators.
为了降低烧结温度，采用MnO作为烧结助剂制备(BaCa)(DyTb)O - x mol% MnO（BCDTZT - x mol% MnO，x = 0.05、0.2、0.4、0.6、0.8、1、1.5、3）无铅压电陶瓷，并系统分析了MnO掺杂量和烧结温度对BCDTZT - x mol% MnO陶瓷的相结构、烧结行为及电学性能的影响。所有陶瓷均具有单一钙钛矿结构且存在多相共存。最佳烧结温度从1515℃降至1425℃，与未掺杂陶瓷相比，所有陶瓷的密度均有所增加，在x = 0.8 mol%时达到最大值5.38 g/cm³。适量的0.4 mol% MnO掺杂量可有效抑制氧空位并改善电学性能，使陶瓷具有最佳综合性能，介电常数最大值为12817，高压电常数为330 pC/N，良好的应变值（S = 0.118%）和低应变滞后（Hys = 2.66%）。活化能计算表明，所有陶瓷的高温导电性均由氧空位主导。结果表明，适量引入MnO作为烧结助剂可在降低烧结温度的同时提高BCZT基陶瓷的性能，在低电场传感器和致动器领域具有较高的实际应用价值。
