Abstract
Ta-substituted Na0.53K0.475Nb0.8Ta0.2O3 ceramics were prepared through the solid-state reaction method. The crystallized single phases were confirmed by X-ray diffraction. The temperature dependences of the dielectric and piezoelectric properties were investigated. Ta substitution in Na0.5K0.5NbO3 enhanced the piezoelectric property, and the corresponding piezoelectric coefficient was estimated to be d33 = 160 pC/N. With increasing temperature, the planar electromechanical coupling coefficient (kp ) increased linearly up to the orthorhombic-tetragonal phase-transition temperature (TO-T ) and decreased as the temperature comes closer to the Curie temperature (Tc ).
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