Impact of Phase Structure on Piezoelectric Properties of Textured Lead-Free Ceramics
Xiaoyi Gao,
Nannan Dong,
Fangquan Xia,
Qinghu Guo,
Hua Hao,
Hanxing Liu,
Shujun Zhang
Affiliations
Xiaoyi Gao
State Key Lab Silicate Materials for Architecture, Center for Smart Materials and Device Integration, School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China
Nannan Dong
State Key Lab Silicate Materials for Architecture, Center for Smart Materials and Device Integration, School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China
Fangquan Xia
School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China
Qinghu Guo
State Key Lab Silicate Materials for Architecture, Center for Smart Materials and Device Integration, School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China
Hua Hao
State Key Lab Silicate Materials for Architecture, Center for Smart Materials and Device Integration, School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China
Hanxing Liu
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, International School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China
Shujun Zhang
Institute for Superconducting and Electronic Materials, Australian Institute of Innovative Materials, University of Wollongong, Wollongong, NSW 2500, Australia
The impact of phase structure on piezoelectric performances of textured Na0.5Bi0.5TiO3 (NBT) based lead-free ceramics was studied, including 0.88NBT-0.08K0.5Bi0.5TiO3-0.04BaTiO3 (88NBT) with morphotropic phase boundary (MPB) composition and 0.90NBT-0.07K0.5Bi0.5TiO3-0.03BaTiO3 (90NBT) with rhombohedral phase. Both textured ceramics exhibit a high Lotgering factor, being on the order of f~96%. The piezoelectric coefficients of the textured 88NBT and 90NBT ceramics are increased by 20% and 60%, respectively, comparing to their randomly oriented ceramics. The piezoelectric enhancement of 90NBT textured ceramic is three times higher than 88NBT, revealing the phase structure plays a significant role in enhancing the piezoelectric performances of textured ceramics. Of particular significance is that the 90NBT textured ceramic exhibits almost hysteresis-free strain behavior. The enhanced piezoelectric property with minimal strain hysteresis is attributed to the poled rhombohedral engineered domain configuration.
