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 NKNLTS ceramics with $Bi_2O_3$ addition

$Bi_2O_3$첨가에 따른 무연 NKNLTS계 세라믹스의 압전특성

  • Lee, Youn-Ki (Department of Materials science and Engineering, Chungju university) ;
  • Lee, Eun-Hee (Department of Materials science and Engineering, Chungju university) ;
  • Woo, Duck-Hyun (Department of Materials science and Engineering, Chungju university) ;
  • Ahn, Sang-Ki (Department of Materials science and Engineering, Chungju university) ;
  • Kwon, Soon-Yong (Department of Materials science and Engineering, Chungju university) ;
  • Ryu, Sung-Lim (Department of Materials science and Engineering, Chungju university)
  • 이윤기 (충주대학교 신소재공학과) ;
  • 이은희 (충주대학교 신소재공학과) ;
  • 우덕현 (충주대학교 신소재공학과) ;
  • 안상기 (충주대학교 신소재공학과) ;
  • 권순용 (충주대학교 신소재공학과) ;
  • 류성림 (충주대학교 신소재공학과)
  • Published : 2009.06.18
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Abstract

Lead-free Piezoelectric $[Li_{0.04}(Na_{0.44}K_{0.56})](Nb_{0.88}Ta_{0.1}Sb_{0.02})$ (abbreviated as NKNLTS) has been synthsized by conventional mixed oxide method traditional ceramics process without cold-isostatic pressing. Effect of $Bi_2O_3$ addition on NKNLTS ceramics was investigated. Piezoelectric properties of the ceramic were varied with the amount of $Bi_2O_3$ addition and showed the maximum Kp value at 0.4wt% $Bi_2O_3$ addition. The results show that the optimum poling condition for NKNLTS ceramics of 3.5kV/mm, poling temperature of $120^{\circ}C$ and poling time of 30min. At the sintering temperature of $1100^{\circ}C$ and the calcination temperature $800^{\circ}C$, the optimal values of density=$4.7g/cm^2$, Kp=0.44, $\varepsilon_r$=1309 were obtained. Consequently, lead free piezoelectric ceramics with the excellent piezoelectric could be fabricated using a conventional mixed oxide process and the optimal manuacturing condition of those was obtained.

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