高性能环境友好型(K,Na)NbO3(KNN)基无铅压电陶瓷是国际上功能陶瓷的重要科学前沿和技术竞争焦点之一。优异的压电性能及其温度稳定性、抗疲劳特性、力学性能以及制备工艺重复性等综合性能是KNN基陶瓷有望得以广泛应用的重要前提, 而这些性能与KNN基陶瓷的多层次结构紧密相关。本工作从多层次结构调控的角度出发, 总结了KNN基陶瓷压电性能与其温度稳定性、抗疲劳特性、力学性能、制备工艺重复性研究等方面的研究进展以及KNN基陶瓷的应用技术研究进展。最后, 就KNN基无铅压电陶瓷的未来发展进行展望。

High-performance environmentally-benign (K,Na)NbO3-based (KNN) lead-free piezoceramics has been the spotlight in the search for functional oxides. The KNN-based piezoceramics with the multiscale structures have the superior piezoelectricity, thermal stability, fatigue resistance, mechanical properties, and reproducibility, for the practical applications. In this review, recent development on the multiscale structural engineering of piezoelectricity, thermal stability, fatigue resistance, mechanical properties, and reproducibility, and the emerging applications of KNN-based lead-free piezoceramics was summarized. In addition, the future perspective for the development of KNN-based piezoceramics was also presented.