Synthesis and Electrical Properties of Li-modified Bi_0.5Na_0.5TiO₃-BaTiO₃ Lead-free Piezoelectric Ceramics

Yunwen Liao1,2) and Dingquan Xiao2) 1) Institute of Applied Chemistry, China West Normal University, Nanchong 637002, China 2) Department of Materials Science, Sichuan University, Chengdu 610064, China

摘 要：Lead-free piezoelectric ceramics （1-y）Bi0.5（Na1-xLix）0.5TiO3-yBaTiO3 with x=0-0.125 and y=0.02-0.12 were fabricated by a solid-state reaction process, and their dielectric, piezoelectric and ferroelectric properties were investigated. The results show that the addition of Li+ significantly improves the sintering performance and piezoelectric properties of the ceramics. X-ray diffraction （XRD） patterns indicate that the ceramics possess pure perovskite structure. At room temperature, the ceramics provide high piezoelectric charge constant d33 （up to 210 pC/N）, high planar electromechanical coupling factor kp （34.5%）, large remanent polarization Pr （up to 40 μC/cm2）, and low coercive field Ec （3.0 kV/mm）, which indicates that （1-y）Bi0.5（Na1-xLix）0.5TiO3-yBaTiO3 is a good lead-free piezoelectric ceramic.

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