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Piezoelectric and Dielectric Characteristics of Lead-free (Na,K)NbO3 Piezoelectric Ceramic System according to Calcination Temperature

하소온도변화에 따른 (Na,K)NbO3계 무연 압전세라믹스의 압전 및 유전특성

  • 류성림 (충주대학교 신소재공학과/친환경 에너지변환, 저장소재 및 부품개발 연구센터) ;
  • 정광현 (세명대학교 전기공학과) ;
  • 류주현 (세명대학교 전기공학과) ;
  • 이병률 (산업자원부) ;
  • 정영호 (한전 전력연구원)
  • Published : 2005.09.01

Abstract

In this paper, in order to develop lead-free piezoelectric ceramics, $(Li_{0.04}Na_{0.44}K_{0.52)(Nb_{0.86}Ta_{0.10}Sb_{0.04})O_3$ ceramics were fabricated with the variation of calcination temperature and sintering temperature. The ceramics couldn't be sintered at temperature less than $1110^{\circ}C$ and showed the highest density at calcination temperature of $800^{\circ}C$. Crystal structure of the ceramics showed pseudo-tetragonal phase. At the calcination temperature of $800^{\circ}C$ and sintering temperature of $1110^{\circ}C$, the optimal values of $density=4.64g/cm^3,\;kp=0.45,\;{\varepsilon}r=1336,\;d_{33}=254pC/N\;and\;Tc=335^{\circ}C$ were obtained.

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