Su Yuanhui, Wang Qingying, Huan Yu, Wang Jianli, Sun Wei, Li Yongjun, Wei Tao, Cheng Zhenxiang
School of Material Science and Engineering, University of Jinan, Jinan, China.
Institute for Superconducting and Electronic Materials, Faculty of Engineering and Information Sciences, University of Wollongong Innovation Campus, North Wollongong, NSW, Australia.
Nat Commun. 2025 Apr 30;16(1):4049. doi: 10.1038/s41467-025-59311-2.
Eco-friendly, lead-free BaTiO-based piezoelectrics are critical for sustainable electronics, but improving their piezoelectric properties often compromises Curie temperature (T). To address this trade-off, we implemented an innovative stress engineering approach by introducing a secondary phase BaAlO in BaCaTiZrO (BCTZ) ceramics. The thermal expansion mismatch between BCTZ and BaAlO induces internal stress within the BCTZ matrix, causing significant lattice distortion and phase fraction modulation, which improves both T and the piezoelectric coefficient (d). Additionally, the local electric field and Al doping in ABO lattice further enhance d. Optimized BCTZ ceramics achieve d of 650 ± 16 pC N, d of 1070 pm V, and T of 96.5 ± 1.0 °C, placing them at the forefront of lead-free BaTiO-based piezoelectrics. This study underscores the effectiveness of bulk stress engineering via a secondary phase for enhancing lead-free piezoelectric ceramics, paving the way for developing high-performance piezoelectric ceramics suitable for broad temperature applications.
对可持续电子产品而言，环保、无铅的钛酸钡基压电材料至关重要，但提高其压电性能往往会使居里温度（T）降低。为解决这一权衡问题，我们通过在BaCaTiZrO（BCTZ）陶瓷中引入第二相BaAlO实施了一种创新的应力工程方法。BCTZ与BaAlO之间的热膨胀失配在BCTZ基体中诱导出内应力，导致显著的晶格畸变和相分数调制，这同时提高了T和压电系数（d）。此外，ABO晶格中的局部电场和Al掺杂进一步提高了d。优化后的BCTZ陶瓷实现了650±16 pC N的d、1070 pm V的d和96.5±1.0 °C的T，使其处于无铅钛酸钡基压电材料的前沿。本研究强调了通过第二相进行体应力工程对增强无铅压电陶瓷的有效性，为开发适用于宽温度应用的高性能压电陶瓷铺平了道路。
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