High Piezoelectricity in Eco-Friendly NaNbO 3 -Based Ferroelectric Relaxor Ceramics via Phase and Domain Engineering

• Published in: ACS applied materials & interfaces 2023-02, Vol.15 (4), p.5399-5410
• Main Authors: Cao, Yingbo, Lin, Jinfeng, Shi, Yunjing, Li, Guohui, Shi, Cheng, Zhu, Kun, Ge, Guanglong, Chen, Chukai, Yan, Fei, Yang, Weiwei, Xu, Lihui, Shen, Bo, Zhai, Jiwei
• Format: Article
• Language: English
• ISSN: 1944-8244; 1944-8252
• DOI: 10.1021/acsami.2c14737

To meet the requirements of environmental friendliness, high-performance lead-free piezoelectric materials have become important materials for next-generation electronic devices. Here, lead-free and potassium-free NaNbO (NN)-based ceramics with high piezoelectric ( = 361 ± 10 pC/N) and dielectric (ε = 4500) properties were obtained by tolerant preparation techniques. The excellent piezoelectric and dielectric properties can be attributed to the relaxor morphotropic phase boundaries (R-MPB) and coexisting domain regions, which are beneficial in lowering the free energy and greatly improving the dielectric response and domain switching capability. Furthermore, the of NaNbO -10Ba(Ti Sn )O -1.5NaSbO (NN-10BTS-1.5NS) ceramics can be maintained at 350 pC/N over the range of 25-80 °C with a change rate of less than 10%, exhibiting excellent temperature stability. Based on a series of in situ characterizations, the variations of the phase and domain structures of NN-based relaxor piezoelectric ceramics with temperature are clearly demonstrated. This work not only proposes new materials for sensors and actuators but also provides an excellent strategy for designing high-performance piezoelectric ceramics through phase and domain engineering.