The (1–𝑥)Bi0.5(Na0.82K0.18)0.5TiO3–𝑥LiSbO3 (𝑥 = 0−0.03) lead-free piezoelectric ceramics were fabricated by a conventional solid-state reaction method and the effect of LiSbO3 addition on microstructure and electrical properties of the ceramics was investigated. The results of XRD measurement show that Li+ and Sb5+ diffuse into the Bi0.5(Na0.82K0.18)0.5TiO3 lattices to form a solid solution with a pure perovskite structure. The LiSbO3 addition has no remarkable effect on the crystal structure. However, a significant change in grain size took place. Simultaneously, with increasing amount of LiSbO3, the temperature for a antiferroelectric to paraelectric phase transition clearly increases. The piezoelectric constant 𝑑33 and the electromechanical coupling factor 𝑘p show an obvious improvement by adding small amount of LiSbO3, which shows optimum values of 𝑑33 = 175 pC/N and 𝑘p = 0.36 at 𝑥 = 0.01.
Volume 43, 2020
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