Defect-Structure-Related Ferroelectric Properties of K0.5Na0.5NbO3 Lead-Free Piezoelectric Ceramics

Authors

  • Shanming Ke College of Materials Science and Engineering and Shenzhen Key Laboratory of Special Functional Materials, Shenzhen University, Shenzhen 518060, China
  • Manfang Mai College of Materials Science and Engineering and Shenzhen Key Laboratory of Special Functional Materials, Shenzhen University, Shenzhen 518060, China
  • Tao Li College of Materials Science and Engineering and Shenzhen Key Laboratory of Special Functional Materials, Shenzhen University, Shenzhen 518060, China
  • Mao Ye College of Materials Science and Engineering and Shenzhen Key Laboratory of Special Functional Materials, Shenzhen University, Shenzhen 518060, China
  • Peng Lin College of Materials Science and Engineering and Shenzhen Key Laboratory of Special Functional Materials, Shenzhen University, Shenzhen 518060, China
  • Xierong Zeng College of Materials Science and Engineering and Shenzhen Key Laboratory of Special Functional Materials, Shenzhen University, Shenzhen 518060, China
  • L.M. Zhou Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hong Kong
  • Y.W. Mai Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hong Kong
  • Haitao Huang Department of Applied Physics and Materials Research Centre, The Hong Kong Polytechnic University, Hong Kong

DOI:

https://doi.org/10.15379/2408-977X.2015.02.02.6

Keywords:

Defect complex, K0.5Na0.5NbO3, EPR, Ferroelectric polarization, KNN ceramics

Abstract

Lead-free piezoelectric ceramics K0.5Na0.5NbO3 (KNN) doped with Cu, Fe, and Ni have been prepared by a conventional ceramic process. The results reveal that Cu-doped KNN ceramic exhibits double-loop-like characteristics, while Fe & Ni-doped KNN ceramics show normal single loops. EPR spectra verified the formation of irreversible defect complex (DC1) and (DC2) in Cu-doped ceramics, while defect complexes were observed in Fe-doped ceramics and very small defect complex signal in Ni-doped ceramics. The experimental results show that the ferroelectric properties of KNN ceramics are strongly related to these defect structures.

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Published

2015-12-18

Issue

Vol. 2 No. 2 (2015)

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