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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Piezoelectric and Dielectric Properties of NKN-(1-x)BNT-xBT Ceramics

NKN-(1-x)BNT-xBT 세라믹스의 압전 및 유전특성

  • Lee, Seung-Hwan (Department of Electronic Materials Engineering, Kwangwoon University) ;
  • Nam, Sung-Pill (Department of Ceramic Engineering, Gyeongsang National University) ;
  • Lee, Sung-Gap (Department of Ceramic Engineering, Gyeongsang National University) ;
  • Lee, Young-Hie (Department of Electronic Materials Engineering, Kwangwoon University)
  • 이승환 (광운대학교 전자재료공학과) ;
  • 남성필 (경상대학교 세라믹공학과) ;
  • 이성갑 (경상대학교 세라믹공학과) ;
  • 이영희 (광운대학교 전자재료공학과)
  • Received : 2010.08.11
  • Accepted : 2010.09.17
  • Published : 2010.10.01
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Abstract

In this study, piezoelectric and dielectric properties of the $(Na_{0.5}K_{0.5})NbO_3-(1-x)(Bi_{0.5}Na_{0.5})TiO_3-xBaTiO_3$ [NKN-(1-x)BNT-xBT] ceramics were investigated. The lead-free NKN-(1-x)BNT-xBT ceramics were fabricated by a conventional mixed oxide method. The results indicate that the addition of $BaTiO_3$ significantly influences the sintering, microstructure, phase transition and electrical properties of NKN-BNT ceramics. A gradual change in the piezoelectric and dielectric properties was observed with the increase of BT contents. The dielectric constant, piezoelectric constant ($d_{33}$) and electromechanical coupling factor ($k_p$) increased at the morphotropic phase boundary (MPB). The $d_{33}$=184 pC/N, $k_p$=0.38, dielectric constant=1455 with dielectric loss value of less than 1% were obtained for the NKN-0.95BNT-0.05BT ceramics sintered at $1150^{\circ}C$ for 2h. These results demonstrate that the NKN-(1-x)BNT-xBT ceramics is an attractive candidate for lead-free piezoelectric materials.

Keywords

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