The microstructures and electrical properties of Bi0 .5(Na1-x-yKxLiv)0 .5TiO3 lead-free piezoelectric ceramics were studied . These ceramics were prepared by conventional ceramic technique .XRD analysis reveals that the ceramics possess almost pure perovskite phase when y≤0 .2 . The SEM results show that, with more amounts of Li+, the crystalline grain growing speed is accelerated, and the sintering temperature can effectively be decreased . The measurements of piezoelectric properties in-dicate that the ceramics with relatively low amount of Li+ and high amount of K+ have comparatively large piezoelectricity . The dielectric measurements show that the ceramics have properties like relaxor ferroelectrics and diffuse phase transition (DPT) at Td and Tc, respectively . The results of ferroelectric measurements reveal the system has relatively higher remanent polarization Pr (27 .6 μ C/cm2) and lower coercive field Ec (37 .5 kV/cm) .
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