Journal of the Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회논문지)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Phase Transitional Behavior and Piezoelectric Properties of 0.94(Na0.5K0.5NbO3-0.06Ba(Ti0.9Sn0.1)O3 Lead-free Ceramics

무연계 0.94(Na0.5K0.5NbO3-0.06Ba(Ti0.9Sn0.1)O3 세라믹의 상전이 거동과 압전 특성

  • 차유정 (한국세라믹기술원 전자부품팀) ;
  • 남산 (고려대학교 신소재공학과) ;
  • 정영훈 (한국세라믹기술원 전자부품팀) ;
  • 이영진 (한국세라믹기술원 전자부품팀) ;
  • 백종후 (한국세라믹기술원 전자부품팀)
  • Published : 2009.09.01
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Abstract

Lead-free $0.94(Na_{0.5}K_{0.5})NbO_3$-0.06Ba$(Ti_{0.9}Sn_{0.1})O_3$ [0.94NKN-0.06BTS] ceramics doped with 1 mol% $MnO_2$ were synthesized by a conventional solid state method. The phase transitional behavior and piezoelectric properties of the ceramics sintered at various temperatures were investigated. The 0.94NKN-0.06BTS ceramics sintered at $1050^{\circ}C$, having morphotropic phase boundary of orthorhombic and tetragonal phases, exhibited a microstructure with abnormal grain growth. A diffused phase transition behavior for all the specimens was verified as high degree of diffuseness (${\gamma}$) values from 1.45 to 1.79. A high piezoelectric constant of $d_{33}=256$ pC/N and a satisfactory electromechanical coupling factor of $k_p=42%$ were obtained for the relatively dense 0.94NKN-0.06BTS ceramics sintered at $1050^{\circ}C$.

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References

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