Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Figures of Merit of (K,Na,Li)(Nb,Ta)O3 Ceramics with Various Li Contents for a Piezoelectric Energy Harvester

  • Go, Su Hwan (Department of Materials Science and Engineering, Hoseo University) ;
  • Kim, Dae Su (Department of Materials Science and Engineering, Hoseo University) ;
  • Han, Seung Ho (Electronic Materials and Device Research Center, Korea Electronics Technology Institute) ;
  • Kang, Hyung-Won (Electronic Materials and Device Research Center, Korea Electronics Technology Institute) ;
  • Lee, Hyeung-Gyu (Electronic Materials and Device Research Center, Korea Electronics Technology Institute) ;
  • Cheon, Chae Il (Department of Materials Science and Engineering, Hoseo University)
  • Received : 2017.09.20
  • Accepted : 2017.10.25
  • Published : 2017.11.30
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Abstract

The figures of merit in the on-resonance and off-resonance conditions ($FOM_{on}$ and $FOM_{off}$) for the piezoelectric energy harvester (PEH) were measured and compared in $[(K_{0.485}Na_{0.515})_{1-X}Li_X](Nb_{0.99}Ta_{0.01})O_3$ (x = 0.04 ~ 0.09) (KNLNT) ceramics with various Li contents. The crystal structure of CuO-doped KNLNT ceramics changes from orthorhombic to tetragonal around the Li fraction of 0.065. The stable temperature range for the tetragonal phase widens to both higher and lower temperatures as Li is substituted. The piezoelectric charge constant ($d_{33}$), electromechanical coupling factor ($k_p$) and mechanical quality factor ($Q_m$) have maximum values at the Li fraction between 0.055 and 0.065 where the phase boundary lies between the orthorhombic and tetragonal phases. Both $FOM_{on}$ and $FOM_{off}$ have peak values around the phase boundary but the peak compositions are not exactly coincided. The optimal Li fraction in the KNLNT ceramic for a PEH application was found to be between 0.055 and 0.065.

Keywords

References

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