Frontiers of Mechanical Engineering >

2009 , Vol. 4 >Issue 3: 345 - 349

DOI: https://doi.org/10.1007/s11465-009-0050-9

RESEARCH ARTICLE

Microstructure and electrical properties of NaNbO3-BaTiO3 lead-free piezoelectric ceramics

  • Shihui XIE ,
  • Kongjun ZHU ,
  • Jinhao QIU ,
  • Hua GUO
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  • Aeronautic Key Laboratory for Smart Materials & Structures, Nanjing University of Aeronautics & Astronautics, Nanjing, 210016, China

Received date: 10 Nov 2008

Accepted date: 01 Dec 2008

Published date: 05 Sep 2009

Copyright

2014 Higher Education Press and Springer-Verlag Berlin Heidelberg
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Abstract

Lead-free piezoelectric ceramics (1-x)NaNbO3-xBaTiO3 have been fabricated by a traditional ceramic sintering technique. The effects of BaTiO3 (BT) synthesized by hydrothermal method on crystal structure, density, dielectric, piezoelectric, and electromechanical properties were investigated. Results show that the phase structure transforms from the orthorhombic phase to the tetragonal phase with the increase of the content of BT, and the two phases co-exist when 0.08<x≤0.10. However, the optimum composition for (1-x)NaNbO3-xBaTiO3 ceramics is 0.90NaNbO3-0.10BaTiO3. The 0.90NaNbO3-0.10BaTiO3 ceramics sintered at 1250°C have higher properties: piezoelectric constant d33 of 120 pC/N, dielectric constant ϵr of 718, planar electromechanical coupling factor kp of 24%, planar frequency Nd of 3 MHz·mm, and the mechanical quality factor Qm of 138, respectively. The results show that the (1-x)NaNbO3-xBaTiO3 ceramics is one of the promising lead-free materials for high-frequency applications.

Key words： Lead-free piezoelectric ceramics; NaNbO3-BaTiO3; piezoelectricity; ceramics; crystal structure; microstructure

Cite this article

Shihui XIE , Kongjun ZHU , Jinhao QIU , Hua GUO . Microstructure and electrical properties of NaNbO3-BaTiO3 lead-free piezoelectric ceramics[J]. Frontiers of Mechanical Engineering, 2009 , 4(3) : 345 -349 . DOI: 10.1007/s11465-009-0050-9

Acknowledgements

The authors would like to thank the financial support from the Fostering Fund of the Ministry of Education (No. 707031) and the National 863 Foundation Program (No. 2007AA03Z104).

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