Achieving high Curie temperature and prominent piezoelectric response via site engineering for BiFeO3-BaTiO3 ceramics

作者：Cui, Yongbao; Li, Chunchun^*; Lei, Xiuyun; Li, Fengrong; Sun, Haochen; Wang, Zhaojie; Wang, Suning; Peng, Biaolin; Wang, Dawei; Yan, Feng; Yan, Tianxiang^*; Liu, Laijun^*

来源：Journal of Alloys and Compounds, 2023, 943: 169137.

DOI：10.1016/j.jallcom.2023.169137

• BiFeO3-BaTiO3
• Site engineering
• Crystal structure
• Piezoelectricity
• High-Curie temperature

In this paper, we proposed an effective strategy to overcome the trade-off between piezoelectric coefficient and the Curie temperature via co-doping of K+ and Nb5+ ions at A/B sites, achieving a combination of high TC and d33 in BiFeO3-BaTiO3-based ceramics. The MPB region was confirmed in a very narrow range of x = 0.0075-0.01 by the Rietveld refinement of XRD patterns and Raman spectroscopy deconvolution. An optimized composition with 1 mol% K/Nb co-dopants possesses a high Curie temperature (TC = 604 degrees C) along with d33 = 163 pC/N, kp = 43 %, Pr = 57.94 mu C/cm2, and Ps = 68.18 mu C/cm2. An outstanding thermal stability to 540 degrees C was verified via the temperature dependence of d33 and in situ Raman spectroscopy. This work not only affords a potential lead-free candidate material for the high-temperature piezoelectric ap-plication, but also provides a feasible strategy to design high-temperature dielectrics by exploiting the site engineering.

• 单位
  西安电子科技大学; 桂林理工大学; 西安交通大学