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http://dx.doi.org/10.4313/JKEM.2017.30.3.157

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

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)
Publication Information
Journal of the Korean Institute of Electrical and Electronic Material Engineers / v.30, no.3, 2017 , pp. 157-161 More about this Journal
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.
Keywords
Piezoelectric; Ferroelectric; $(1-x)Bi_{0.5}(Na_{0.78}K_{0.22})_{0.5}TiO_3-xLaFeO_3$;
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