Piezoelectric Properties in ZnO Dopped (Na,K)NbO3 Ceramics

ZnO가 첨가된 (Na,K)NbO3계 세라믹스의 압전 특성

  • 류성림 (충주대학교 신소재공학과/친환경 에너지변환, 저장 소재 및 부품개발 연구센터) ;
  • 권순용 (충주대학교 신소재공학과/친환경 에너지변환, 저장 소재 및 부품개발 연구센터) ;
  • 어순철 (충주대학교 신소재공학과/친환경 에너지변환, 저장 소재 및 부품개발 연구센터) ;
  • 김시철 (충주대학교 신소재공학과/친환경 에너지변환, 저장 소재 및 부품개발 연구센터) ;
  • 류주현 (세명대학교 전기공학과)
  • Published : 2006.08.01


ZnO was doped up to 0.3 wt% for improving the electrical properties of lead-free $[Li_{0.04}(Na_{0.44}Ko_{0.52})-(Nb_{0.86}\;Ta_{0.10}\;Sb_{0.04})]O_3$ piezoelectric ceramics. The ceramics were fabricated with the conventional sintering processes. Crystal structure of the samples was tetragonal phase regardless of ZnO amount. However, the piezoelectric properties were varied with the ZnO amount. The electro-mechanical coupling factor $(k_p)$ was with the ZnO amount up to 0.2 wt% but decreased with the further addition. the maximum value of $k_p$ was 0.475. Density, piezoelectric charge constant and relative dielectric constant was also showed maximum value at 0.2 wt%. The maximum values are $4.75g/cm^3$, 275 pC/N, 1403, respectively. In contrast, the mechanical quality factor $(Q_m)$ was not varied with increasing the ZnO addition up to 0.2 wt% but rapidly increased at 0.3 wt%.


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