Yuanhui Su, Qingying Wang, Yu Huan, Jianli Wang, Wei Sun, Yongjun Li, Tao Wei, Zhenxiang Cheng
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引用次数: 0
摘要
环保、无铅的batio3基压电材料对可持续电子产品至关重要，但提高其压电性能往往会降低居里温度（TC）。为了解决这个问题，我们实施了一种创新的应力工程方法，在Ba0.85Ca0.15Ti0.9Zr0.1O3 （BCTZ）陶瓷中引入二次相BaAl2O4。BCTZ与BaAl2O4之间的热膨胀失配导致BCTZ基体内部产生内应力，导致显著的晶格畸变和相分数调制，从而提高了TC和压电系数（d33）。此外，ABO3晶格中的局域电场和Al3+的掺杂进一步增强了d33。优化后的BCTZ陶瓷的d33为650±16 pC N−1，d33*为1070 pm V−1，TC为96.5±1.0°C，处于无铅batio3基压电材料的前沿。该研究强调了通过第二阶段的体应力工程来增强无铅压电陶瓷的有效性，为开发适用于广泛温度应用的高性能压电陶瓷铺平了道路。
Concurrently enhanced piezoelectric performance and curie temperature in stressed lead-free Ba0.85Ca0.15Ti0.9Zr0.1O3 ceramics
Eco-friendly, lead-free BaTiO3-based piezoelectrics are critical for sustainable electronics, but improving their piezoelectric properties often compromises Curie temperature (TC). To address this trade-off, we implemented an innovative stress engineering approach by introducing a secondary phase BaAl2O4 in Ba0.85Ca0.15Ti0.9Zr0.1O3 (BCTZ) ceramics. The thermal expansion mismatch between BCTZ and BaAl2O4 induces internal stress within the BCTZ matrix, causing significant lattice distortion and phase fraction modulation, which improves both TC and the piezoelectric coefficient (d33). Additionally, the local electric field and Al3+ doping in ABO3 lattice further enhance d33. Optimized BCTZ ceramics achieve d33 of 650 ± 16 pC N−1, d33* of 1070 pm V−1, and TC of 96.5 ± 1.0 °C, placing them at the forefront of lead-free BaTiO3-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.
期刊介绍：
Nature Communications, an open-access journal, publishes high-quality research spanning all areas of the natural sciences. Papers featured in the journal showcase significant advances relevant to specialists in each respective field. With a 2-year impact factor of 16.6 (2022) and a median time of 8 days from submission to the first editorial decision, Nature Communications is committed to rapid dissemination of research findings. As a multidisciplinary journal, it welcomes contributions from biological, health, physical, chemical, Earth, social, mathematical, applied, and engineering sciences, aiming to highlight important breakthroughs within each domain.
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