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Journal of Electroceramics

, Volume 34, Issue 4, pp 255–261 | Cite as

Improved piezoelectric and energy harvesting characteristics in lead-free Fe2O3 modified KNN ceramics

  • Indrani CoondooEmail author
  • Neeraj Panwar
  • Hiroshi Maiwa
  • Andrei L. Kholkin
Article

Abstract

Lead-free piezoelectric ceramics gained an increased attention due to their high piezoelectric properties combined with the absence of lead and other potentially hazardous elements. In this work, we used a unimorph cantilever beam arrangement to study piezoelectric energy harvesting in pristine K0.5Na0.5NbO3 (KNN) and Fe2O3 modified KNN (KNFN) ceramics that are potential candidates for PZT replacement. The piezoelectric ceramics were synthesized using conventional solid state reaction method. The KNFN ceramics exhibited a superior piezoelectric performance: d 33 = 100 pC/N and mechanical quality factor (Q m = 135) as compared to KNN (d 33 = 83 pC/N; Q m = 76). In addition, the planar electromechanical coupling factor k p was higher in case of KNFN having a value of 0.39 as compared to 0.34 for KNN. The KNFN harvester generated an output power of 0.38 mW/cm3 at a load resistance of 470 kΩ for a transverse displacement amplitude of 1.2 mm. The prospects of using lead-free ceramics for piezoelectric energy harvesting are discussed.

Keywords

Lead free Piezoelectrics Energy harvesting Ceramics 

Notes

Acknowledgments

One of the authors (I.C.) would like to thank the Portuguese Foundation for Science and Technology (FCT) for the Postdoctoral Grant [No. SFRH/BPD/81032/2011]. Funding from FCT project PTDC/FIS/108025/2008 is highly appreciated.

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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  • Indrani Coondoo
    • 1
    Email author
  • Neeraj Panwar
    • 2
  • Hiroshi Maiwa
    • 3
  • Andrei L. Kholkin
    • 1
  1. 1.Department of Materials and Ceramic Engineering & CICECOUniversity of AveiroAveiroPortugal
  2. 2.Department of PhysicsCentral University of RajasthanKishangarhIndia
  3. 3.Materials and Human Environmental SciencesShonan Institute of TechnologyFujisawaJapan

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