Abstract
Lead-free ceramics (K0.5+x Na0.5)NbO3 (0 ≤ x ≤ 0.3, KNN-x) were prepared following a novel method by mixing perovskite structure of NaNbO3 and KNbO3 powders. Effects of K excess and sintering temperatures on phase structure, microstructure and electrical properties of KNN ceramics were investigated. Result showed that the single phase perovskite structure was obtained in ceramics which sintered at 1075°C except the KNN-x ceramic with x = 0.3. The KNN-x ceramic with x = 0.2 showed optimized ferroelectric property with Pr = 25.5 μC/cm2 at Ec = 4.57 kV/cm and piezoelectric property with d33 = 117 pC/N because of the single perovskite structure and homogeneous dense microstructure. The results show that K excess ceramics are a promising candidate for lead-free materials.
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