(1 − x)(K0.5Na0.5)NbO3–xSr0.53Ba0.47Nb2O6 [(1 − x)KNN–xSBN] ceramics were synthesized by solid-state reaction technique. X-ray diffraction analysis of samples indicated that a single orthorhombic perovskite phase was formed as the x value is ≤0.02. Optimized piezoelectric properties with d 33 = 126 pC/N, K p = 0.39, Q m = 201 were obtained for 0.98KNN–0.02SBN ceramic. The dielectric properties studies illustrated that both peaks of orthorhombic to tetragonal (T O–T ) and ferroelectric tetragonal to paraelectric cubic (T C ) phase transition shifted to lower temperature. The maximum remanent polarization (P r = 22.5 μC/cm2) for 0.98KNN–0.02SBN was obtained by the polarization versus electric field (P–E) researches. AC conductivity of samples increased with increasing the temperature. The calculated activation energy of the dc conductivity was 0.9654 eV, which may be due to thermal activation.