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Piezoelectric and Dielectric Characteristics of Lead Free (Na1/2K1/2)NbO3 Ceramics Doped with CuO and MnO2 using Design of Experiments

실험계획법을 적용한 무연 (Na1/2K1/2)NbO3세라믹스의 CuO 및 MnO2 첨가에 따른 압전 및 유전 특성

  • 윤중락 (삼화콘덴서공업(주) 부설연구소) ;
  • 이창배 (삼화콘덴서공업(주) 부설연구소) ;
  • 이경민 (삼화콘덴서공업(주) 부설연구소) ;
  • 이헌용 (명지대학교 전기공학과) ;
  • 이동희 (수원대학교 전기공학과)
  • Published : 2009.08.01

Abstract

Lead-free piezoelectric ($Na_{1/2}K_{1/2}$)$NbO_3$ ceramics doped with CuO and $MnO_2$ were fabricated using the conventional oxide-mixing technique. With increasing content of CuO and $MnO_2$, the dielectric constant(${\varepsilon}_{33}$) and mechanical quality factor($Q_m$) value increased, while electromechanical coupling factor($K_p$) and piezoelectric constant($d_{33}$) decreased. The piezoelectric and dielectric properties ($Na_{1/2}K_{1/2}$)$NbO_3$ ceramics doped with CuO 2.461 wt% and $MnO_2$ 0.538 wt% at sintered temperature $1050\;^{\circ}C$ were attained ${\varepsilon}_{33}$ = 403, $K_p$ = 15, $Q_m$ = 122 and $d_{33}$ = 36 pC/N. Based on response surface methodology results using design of experiment, it was concluded that ($Na_{1/2}K_{1/2}$)$NbO_3$ doped with CuO 0.477 wt% and $MnO_2$ 0.269 wt% has possibility composition of being used for piezoelectric transformer.

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