Abstract
CuO-doped 0.98K 0.5Na 0.5NbO 3–0.02BiScO 3 (0.98KNN–0.02BS– xCu) lead-free piezoelectric ceramics have been fabricated by ordinary sintering technique. The effects of CuO doping on the dielectric, piezoelectric, and ferroelectric properties of the ceramics were mainly investigated. X-ray diffraction reveals that the samples at doping levels of x ≤ 0.01 possess a pure tetragonal perovskite structure. The specimen doped with 1 mol% CuO exhibits enhanced electrical properties ( d 33 ~ 207 pC/N, k p ~ 0.421, and k t = 0.424) and relatively high mechanical quality factor ( Q m = 288). These results indicate that the 0.98KNN–0.02BS–0.01Cu ceramic is a promising candidate for lead-free piezoelectric ceramics for applications such as piezoelectric actuators, harmonic oscillator and so on.
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