J. Mater. Sci. Technol. ›› 2020, Vol. 45: 15-22.DOI: 10.1016/j.jmst.2019.09.040

• Research Article • Previous Articles     Next Articles

Large electric field-induced strain in the novel BNKTAN-BNBLTZ lead-free ceramics

Chao Wang*(), Qiang Li*(), Weiming Zhang, Huiqing Fan   

  1. State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, China
  • Received:2019-07-16 Revised:2019-08-22 Accepted:2019-09-12 Published:2020-05-15 Online:2020-05-27
  • Contact: Chao Wang,Qiang Li

Abstract:

(1-x)Bi0.5(Na0.82K0.18)0.5Ti0.96(Al0.5Nb0.5)0.04O3-xBi0.46Na0.46Ba0.5La0.02Ti0.97Zr0.03O3 lead-free ceramics (abbreviated as BNKTAN-100xBNBLTZ) was prepared by the conventional solid reaction. XRD patterns and EDS spectrums revealed that a stable solid solution had been formed between BNBLTZ and BNKTAN. With the introduction of BNBLTZ anti-ferroelectric content, BNKTAN relaxor ferroelectrics exhibited the excellent field-induced-strain for x = 0.04 corresponding to electric field-induced strain S ~ 0.505 % and normal strain d33* ~777 pm/V at 65 kV/cm. The large strain response was attributed to the emergence of PNRs in the relaxation process. Additionally, an excellent fatigue resistance performance was obtained within 105 cycles (S = 0.505 %-0.495 % and d33* = 777-758 pm/V, 65 kV/cm). It suggested that prepared ceramics had the great potential to strain sensor and actuators.

Key words: BNT-based ceramics, Ferroelectric properties, Strain, Fatigue resistance