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Sodium potassium niobate, (Na0.5K0.5)NbO3, fine powder has been successfully synthesized at the low temperature of 550degC through a modified solid-state reaction method, in which urea [CO(NH2)2] plays an important role. High-density (Na0.5K0.5)NbO3 ceramics could be obtained by conventional sintering of the synthesized (Na0.5K0.5)NbO3 fine powder with the addition of 0.03 mol% Co3O4 as a sintering additive. The crystal structure, microstructure, and dielectric and piezoelectric properties were characterized. The (Na0.5K0.5)NbO3 ceramic showed a comparatively saturated P-E hysteresis loop. The (Na0.5K0.5)NbO3 ceramic also displayed piezoelectricity with a piezoelectric constant d33 of 126 pC/N and a planar electromechanical coupling factor kp of 33%.