Abstract
(1 − x)(K 0.48Na 0.52)NbO 3- xBiCoO 3 [KNN- xBC] lead-free piezoelectric ceramics were prepared by the conventional solid-state sintering method. The effects of the BiCoO 3 addition on the phase structure, dielectric, piezoelectric and ferroelectric properties of KNN- xBC ceramics were systematically investigated. The polymorphic phase transition (PPT) from rhombohedral to orthorhombic phase around room temperature was identified in the composition range of 0.01 ≤ x ≤ 0.02, and the improved electrical properties were induced by this PPT. The KNN-0.01BC ceramics near PPT exhibit optimum electrical properties: d 33 ∼ 165 pC/N, k p ∼ 0.40, P r ∼ 31.0 μC/cm 2, and E c ∼ 12.6 kV/cm. These results indicate that the enhanced piezoelectric properties for alkali niobate can be achieved by forming the coexistence of rhombohedral and orthorhombic phases.
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