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<p>Designing high-temperature piezoelectric materials that combine an outstanding piezoelectric constant with increased electrical resistivity continues to be a major challenge. In this work, MnO<sub>2</sub> was introduced into Bi<sub>2.98</sub>Ce<sub>0.02</sub>TiNb<sub>0.98</sub>Mo<sub>0.02</sub>O<sub>9</sub> (BCTNM) ceramics to address this issue. The findings demonstrate that a proper level of MnO<sub>2</sub> doping is effectively incorporated into the lattice, resulting in increased distortion of the (Ti,Nb)O<sub>6</sub> octahedron and defect optimization. These microstructural modifications contribute to a notable improvement in the overall electrical properties. An optimized BCTNM-0.2Mn composition achieves a <i>d</i><sub>33</sub> value of 18 pC/N, an exceptional Curie point of 911&#xa0;°C, and an electrical resistivity reaching 3.37 × 10<sup>6</sup> Ω·cm at 500&#xa0;°C. Moreover, it indicates excellent thermal endurance, retaining over 90% of its initial value following annealing at 500&#xa0;°C. This study demonstrates that MnO<sub>2</sub> doping provides an efficient route to improve the performance of BTN-based ceramics, revealing their suitability for extreme environments.</p>

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MnO2-doping drives enhanced piezoelectric performance in Bi3TiNbO9-based ceramics

  • 期刊论文

  • 发表日期：

    2026年4月24日

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  • Xingcong Zhu,
  • Huaxia Wei,
  • Bin Lan,
  • Peng Zheng,
  • Linsheng Sheng,
  • Wangfeng Bai,
  • Guo Zheng

摘要

Designing high-temperature piezoelectric materials that combine an outstanding piezoelectric constant with increased electrical resistivity continues to be a major challenge. In this work, MnO2 was introduced into Bi2.98Ce0.02TiNb0.98Mo0.02O9 (BCTNM) ceramics to address this issue. The findings demonstrate that a proper level of MnO2 doping is effectively incorporated into the lattice, resulting in increased distortion of the (Ti,Nb)O6 octahedron and defect optimization. These microstructural modifications contribute to a notable improvement in the overall electrical properties. An optimized BCTNM-0.2Mn composition achieves a d33 value of 18 pC/N, an exceptional Curie point of 911 °C, and an electrical resistivity reaching 3.37 × 106 Ω·cm at 500 °C. Moreover, it indicates excellent thermal endurance, retaining over 90% of its initial value following annealing at 500 °C. This study demonstrates that MnO2 doping provides an efficient route to improve the performance of BTN-based ceramics, revealing their suitability for extreme environments.