Abstract
Lead-free piezoelectric K0.5Na0.5NbO3-x wt% NiO ceramics have been synthesized by solid state reaction. The phase, microstructure, electric properties of the samples were characterized by XRD, SEM and Agilent 4294A impedance analyzer. The results reveal that NiO diffuses into the K0.5Na0.5NbO3 lattices to form a solid solution of a single phase orthorhombic perovskite structure for x from 0 to 2. With the increase of NiO content, the grain size of those materials increases evidently. However, when x ≥ 1, the grain size decreases, which indicated that more NiO content can inhibit the grain growth. Furthermore, NiO-doping leads to the improvements of ferroelectric and piezoelectric properties. A relatively larger remanent polarization of 21.26 μC/cm2 has been found in the x = 0.5 sample. The coercive field Ec changed a little. The ceramics with x = 0.8 exhibit excellent piezoelectric properties: Qm = 621, kp = 38.3%, tanδ = 2.9%, d33 = 89pC/N.
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