(1-x)Bi0.5(Na0.78K0.22)0.5TiO3-xLaFeO3 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 LaFeO3 was transformed from a ferroelectric tetragonal to a non-polar pesudo-cubic phase with increased LaFeO3 content. The improved piezoelectric properties resulted from the addition of LaFeO3 up to 3 mol%. The LaFeO3 3mol% sample showed markedly improved piezoelectric and strain behaviors in comparison with pure BNKT ceramic.
