Improving the piezoelectric properties of CBN‐based ceramic by a Ce ion
Ning Chen, Fei Wang, Xu Li, Yining Xie, Jingwen Xi, Shangyi Guan, Wei Shi, Hao Chen, Jie Xing, Jianguo Zhu
Abstract
Abstract CaBi 2 Nb 2 O 9 (CBN), one of the bismuth‐layered structural ferroelectrics, with high Curie temperature ( T C ), has great potential in high‐temperature applications. In this work, high Curie temperature and piezoelectric constant ( d 33 ) are realized in modified CaBi 2 Nb 2 O 9 ceramics with Ce‐substitution. Ce‐substitution changes the crystal structures and domain structures of CBN‐based ceramics, so as to improve the piezoelectric properties. The optimal performances are obtained with a high d 33 value (∼18.0 pC/N) and a T C value (∼930°C), together with a low tan δ value (∼0.028 at 500°C). Moreover, the thermal stability is also enhanced, where the d 33 value maintains 93.9% of its original value after annealing at 900°C for 2 h. Thus, these findings play a meaningful role in devices manufacturing, where the apply temperature is often more than 500°C.