Abstract
Abstract(1−x)(K0.5Na0.5)NbO3−xBiScO3 doped with 1 mol% CuO (KNN‐BS‐Cu‐x) lead‐free piezoelectric ceramics were prepared by the solid state reaction technique. With the CuO doping, all the ceramics can be well sintered at 1090–1150 °C and exhibit a perovskite structure. After the substitution of BiScO3, the polymorphic phase transition (PPT) was shifted to near room temperature; besides, the cubic–tetragonal phase transitions were also shifted to lower temperatures and a relaxor behavior was induced. The ceramic (x = 0.018) with PPT near room temperature exhibited excellent electrical properties (d33 = 224 pC/N, kp = 0.40, and TC = 331 °C). A relatively high mechanical quality factor (288) was also obtained in this particular composition. All these results reveal that KNN‐BS‐Cu‐x ceramics may become promising candidates for lead‐free piezoelectric materials.
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