Lead-free (K0.5Na0.5)0.90Li0.06Sr0.02Nb(1x)SbxO3 (KNLSN-Sbx) ceramics were synthesized by ordinary
sintering technique. The compositional dependence of phase structure and electrical properties of the
ceramics was systematically investigated. All samples possessed pure perovskite structure, showing
room temperature symmetries of orthorhombic at xo0.01, coexistence of orthorhombic and tetragonal
phases at x ¼ 0.01, and tetragonal at 0.02rxr0.05. The temperature of the polymorphic phase
transition (PPT) was shifted to lower temperature and dielectric relaxor behavior was induced by
increasing Sb content. The samples near the coexistence region (x ¼ 0.01) exhibited enhanced electrical
properties: d33145 pC/N, kp38% and Pr20.4 mC/cm2
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