In this study, (1-x)(Na0.52K0.443Li0.037)(Nb0.883Sb0.08Ta0.037)O3-x(Bi0.5(Na0.7K0.3)0.5ZrO3 ceramics were fabricated by BNKZ substitution using a conventional solid-state method to develop excellent lead-free piezoelectric ceramics for piezoelectric actuators; their dielectric and piezoelectric properties were then investigated. All specimens were in the orthorhombic phase. NKL-NSTO3 ceramics with x=0.01 showed excellent piezoelectric properties. The density (ρ), piezoelectric charge constant (d33), planar piezoelectric coupling coefficient (kp), mechanical quality factor (Qm), and dielectric constant (εr) had optimized values of 4.56 g/㎤, 208 pC/N, 0.43, 96, and 975, respectively.
