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전단 모드 압전 에너지 하베스팅용 친환경 세라믹 소재

Eco-friendly Ceramic Materials for Shear Mode Piezoelectric Energy Harvesting

  • 한승호 (전자부품연구원 전자소재응용연구센터) ;
  • 박휘열 (전자부품연구원 전자소재응용연구센터) ;
  • 강형원 (전자부품연구원 전자소재응용연구센터) ;
  • 이형규 (전자부품연구원 전자소재응용연구센터)
  • Han, Seung-Ho (Electronic Materials and Device Research Center, Korea Electronics Technology Institute) ;
  • Park, Hwi-Yeol (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)
  • 투고 : 2012.07.05
  • 심사 : 2012.08.01
  • 발행 : 2012.09.01

초록

Eco-friendly $(Na,K)NbO_3$ (NKN)-based piezoelectric ceramic materials were fabricated by conventional ceramic method for shear mode piezoelectric energy harvesting application. $NKN-LiTaO_3$ (LT) based compositions were adopted for the high $d_{15}{\times}g_{15}$ which is proportional to harvested energy density. The composition $0.935(Na_{0.535}K_{0.485})NbO_3-0.065LiTaO_3$ was found to be lie on the boundary of tetragonal and orthorhombic phases. With reducing Ta content, the dielectric constant decreased gradually while maintaining high $d_{15}$, which resulted in increased $d_{15}{\times}g_{15}$. The composition $0.935(Na_{0.535}K_{0.485})NbO_3-0.065Li(Nb_{0.990}Ta_{0.010})O_3$ was found to possess excellent piezoelectric and electromechanical properties ($d_{15}{\times}g_{15}=29\;pm^2/N$, $d_{15}$ = 417 pC/N, $k_{15}$ = 0.55), and high curie temperature ($T_c=455^{\circ}C$).

키워드

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