Abstract
The piezoelectric and dielectric properties of the (1−x)(Bi,Na)TiO3–x(Bi,K)TiO3 (x=0.12, 0.14, 0.18, 0.20 and 0.30) lead-free ceramics were investigated. Specimens were prepared by the conventional mixed oxide method and sintered at 1170°C in air. Scanning electron microscopy indicated that increasing x from 0.12 to 0.30 causes a decrease in the grain size. The (1−x)(Bi,Na)TiO3–x(Bi,K)TiO3 ceramics shows a homogeneous microstructure and excellent dielectric and piezoelectric properties. Specimens with optimum composition showed a piezoelectric charge constant d33 of 166pC/N, an electromechanical coupling factor kp of 0.5, a dielectric constant εr of 1591.32 at 1kHz and generated power output of 37.49nW/cm2.
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