Abstract
A new ternary Bi-based lead-free piezoelectric ceramic system with perovskite structure (1 − x − y)Bi 0.5Na 0.5TiO 3– xBi 0.5K 0.5TiO 3– yBiCrO 3, was prepared by a conventional solid-state reaction method and the effect of amount of Bi 0.5K 0.5TiO 3 and BiCrO 3 on microstructure and electrical properties of the ceramics was investigated. The morphotropic phase boundary (MPB) of the system between rhombohedral and tetragonal locates in the range of x = 0.18–0.21, y = 0–0.02. And an obvious second phase was observed in the samples with y = 0.025 and x = 0.24. The addition of BiCrO 3 caused an insignificant promoted grain growth and Bi 0.5K 0.5TiO 3 suppressed the growth of grain. The dielectric constant ɛ r decreases and dielectric loss tan δ increases with the increase frequency. The optimum piezoelectric properties were obtained near the composition of the MPB. The piezoelectric constant d 33 and the electromechanical coupling factor k p show maximum values of d 33 = 168 pC/N and k p = 0.32 at x = 0.18, y = 0.015 and x = 0.18, y = 0.01, respectively.
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