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Effect of LaFeO3 Doping on the Ferroelectric and Piezoelectric Properties of Bi0.5(Na0.78K0.22)0.5TiO3 Lead-Free Piezoceramics

LaFeO3 함량에 따른 (1-x)Bi0.5(Na0.78K0.22)0.5TiO3-xLaFeO3의 강유전, 압전 특성

  • Park, Chun-Kil (Department of Materials Science and Engineering, Inha University) ;
  • Lim, Ji-Ho (Department of Materials Science and Engineering, Inha University) ;
  • Park, Jung-Soo (Electronic Materials Convergence Division, Korea Institute of Ceramic Engineering and Technology)
  • 박춘길 (인하대학교 신소재공학과) ;
  • 임지호 (인하대학교 신소재공학과) ;
  • 박정수 (한국세라믹기술원 전자소재부품)
  • Received : 2017.01.19
  • Accepted : 2017.02.01
  • Published : 2017.03.01

Abstract

$(1-x)Bi_{0.5}(Na_{0.78}K_{0.22})_{0.5}TiO_3-xLaFeO_3$ ceramics were fabricated using a solid state reaction method. The microstructural, ferroelectric and piezoelectric properties were characterized using X-ray diffraction (XRD), scanning electron microscope (SEM), and polarization hysteresis loops (P-E). XRD results indicated that BNKT ceramic crystal structure modified by $LaFeO_3$ was transformed from a ferroelectric tetragonal to a non-polar pesudo-cubic phase with increased $LaFeO_3$ content. The improved piezoelectric properties resulted from the addition of $LaFeO_3$ up to 3 mol%. The $LaFeO_3$ 3mol% sample showed markedly improved piezoelectric and strain behaviors in comparison with pure BNKT ceramic.

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