Enhanced electrical properties and Vickers hardness of calcium bismuth niobate ceramics by W/Co substituted at B-site

作者：Fei Wang, Jia Yang, Qing Yang, Ning Chen, Xinji Yang, Mingyue Mo, Jie Xing, Zhiyi Tan, Zhongqing Tian, Fancheng Meng, Yuheng Guo, Huixing Lin, Jianguo Zhu · 发表于：Journal of Advanced Dielectrics · 年份：2024 · DOI：10.1142/s2010135x24400198 · 被引用次数：9 · 研究领域：Ferroelectric and Piezoelectric Materials、Acoustic Wave Resonator Technologies、Microwave Dielectric Ceramics Synthesis

Calcium bismuth niobate (CBN) ceramic, as a core element of high-temperature piezoelectric sensors, has attracted widespread attention due to its high Curie temperature within the class of Aurivillius compounds. However, CBN usually faces two shortcomings: poor piezoelectric constant and low resistivity. In this work, CBN-based ceramics with donor–acceptor ions (W/Co) co-substituted at B-site were prepared by solid-state reaction method, and structure–property relationship of ceramics was studied in detail. Co-substitution of W/Co ions effectively improved the electrical property and hardness of CBN ceramics. CaBi 2 Nb[Formula: see text](W[Formula: see text]Co[Formula: see text]O 9 exhibits enhanced electrical and mechanical properties including high resistivity of [Formula: see text]cm at 500°C, piezoelectric constant of [Formula: see text] pC/N and hardness value of [Formula: see text][Formula: see text]GPa. These values are two orders of magnitude, over two times, and 1.36 times higher than those of pure CBN ceramic, respectively. This work provides a reference for exploring other bismuth-layered structural ceramics.