Journal of the Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회논문지)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Effects of KNbO3-Substitution on the Dielectric and Piezoelectric Properties of (Li,Na,K)(Nb,Sb,Ta)O3 System Ceramics

KNbO3 치환이 (Li,Na,K)(Nb,Sb,Ta)O3계 세라믹스의 유전 및 압전 특성에 미치는 영향

  • Noh, Jungrae (Department of Electrical Engineering, Semyung University) ;
  • Yoo, Ju-Hyun (Department of Electrical Engineering, Semyung University) ;
  • Lee, Sang-Don (Department of Electrical Engineering, Gangneung-Wonju National University)
  • 노정래 (세명대학교 전기공학과) ;
  • 류주현 (세명대학교 전기공학과) ;
  • 이상돈 (강릉원주대학교 전기공학과)
  • Received : 2013.01.28
  • Accepted : 2013.02.12
  • Published : 2013.03.01
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Abstract

In this study, $KNbO_3$-substituted (Li,Na,K)(Nb,Sb,Ta)$O_3$ ceramics were investigated to develop Pb-free composition ceramics for multilayer actuator and energy harvester applications. The X-ray diffraction analysis indicated that all samples were pure perovskite phase and no secondary phase was found. A tetragonality as a function of $KNbO_3$ substitution showed the maximum value at 1.5 mol% $KNbO_3$ and then decreased. The SEM image analysis showed the maximum grain size of $3.14{\mu}m$ at 1.5mol% $KNbO_3$. In the composition ceramics with 1.5 mol% $KNbO_3$ sintered at $1,100^{\circ}C$, excellent properties of density= 4.75 $g/cm^3$, electromechanical coupling factor ($k_p$)= 0.50 and piezoelectric constant($d_{33}$)= 290 pC/N were obtained, respectively, suitable for piezoelectric actuator and energy harvester applications.

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References

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