Abstract
(1 − x)(K0.49Na0.51)(Nb0.95Sb0.05)O3–xBi0.5(Na0.82K0.18)0.5ZrO3 (KNNS–xBNKZ, x = 0–0.05) lead-free piezoelectric ceramics were prepared by a solid state reaction route. The effect of BNKZ on the phase transition and electrical properties of the ceramics was investigated. The XRD patterns indicated the formation of a single perovskite phase with the structure changing from orthorhombic to tetragonal to pseudo-cubic by increasing BNKZ doping amount x. A coexistence of orthorhombic and tetragonal phases with 0.03 ≤ x ≤ 0.04 was obtained, leading to strongly enhanced electrical properties of piezoelectric constant d 33 ≥ 400 pC/N and dielectric constant ɛ 33 /ɛ 0 > 2000. Together with relatively low dielectric loss (tanδ < 4 %) and normally high Curie temperature (T c > 200 °C), this lead-free piezoelectric ceramics should be a good candidate for replacing toxic lead-based ones.
Published Version
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