Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference (한국전기전자재료학회:학술대회논문집)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Piezoelectric Properties of Lead-Free $(Na_xK_{0.94-x}Li_{0.06})NbO_3$ Ceramics

$(Na_xK_{0.94-x}Li_{0.06})NbO_3$ 세라믹스의 압전 및 유전 특성

  • 전소현 (한국전기연구원 압전소자그룹) ;
  • 김민수 (한국전기연구원 압전소자그룹) ;
  • 박정주 (경상대학교 세라믹 공학과) ;
  • 전순종 (한국전기연구원 압전소자그룹) ;
  • 김인성 (한국전기연구원 압전소자그룹) ;
  • 송재성 (한국전기연구원 압전소자그룹)
  • Published : 2007.06.21
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Abstract

As a candidate for lead-free piezoelectric materials, dense $(Na_xK_{0.94-x}Li_{0.06})NbO_3$ ceramics were developed by conventional sintering process. Sintering temperature was lowered by adding 1 mol% $Li_2O$ as a sintering aid. The electrical properties of $(Na_xK_{0.94-x}Li_{0.06})NbO_3$ ceramics were investigated as a function of Na/K ratio. When the sample sintered at $950^{\circ}C$ for 4 h with the compositions of morphotropic phase boundary, 0.47 < x < 0.51, electro-mechanical coupling factor ($k_p$) and piezoelectric coefficient ($d_{33}$) were found to reach the highest values of 0.42 and 190 pC/N, respectively. These excellent piezoelectric and electro-mechanical properties indicate that this system is potentially good candidate for lead-free material for a wide range of electro-mechanical transducer applications.

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