Journal of Materials Science

, Volume 44, Issue 10, pp 2466–2470 | Cite as

Microstructure, electrical properties of CeO2-doped (K0.5Na0.5)NbO3 lead-free piezoelectric ceramics

  • Daojiang Gao
  • K. W. Kwok
  • Dunmin Lin
  • H. L. W. Chan
Article

Abstract

CeO2-doped K0.5Na0.5NbO3 lead-free piezoelectric ceramics have been fabricated by a conventional ceramic fabrication technique. The ceramics retain the orthorhombic perovskite structure at low doping levels (<1 mol.%). Our results also demonstrate that the Ce-doping can suppress the grain growth, promote the densification, decrease the ferroelectric–paraelectric phase transition temperature (TC), and improve the dielectric and piezoelectric properties. For the ceramic doped with 0.75 mol.% CeO2, the dielectric and piezoelectric properties become optimum: piezoelectric coefficient d33 = 130 pC/N, planar electromechanical coupling coefficient kp = 0.38, relative permittivity εr = 820, and loss tangent tanδ = 3%.

Notes

Acknowledgements

This work was supported by the Research Grants Council of the Hong Kong Special Administrative Region (Project No. PolyU 5188/06E) and the Centre for Smart Materials of The Hong Kong Polytechnic University.

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Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  • Daojiang Gao
    • 1
  • K. W. Kwok
    • 1
  • Dunmin Lin
    • 1
  • H. L. W. Chan
    • 1
  1. 1.Department of Applied Physics and Materials Research CentreThe Hong Kong Polytechnic UniversityKowloonHong Kong, China

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