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1-x)K 0.5 Na 0.5 Nb 1-y Sb y O 3 -zSrZrO 3 -xBi 0.5 Na 0.5 HfO 3 (KNNS-SZ-BNH) lead-free ceramics were developed by the conventional solid-state reaction method. Effects of the additives (Bi 0.5 Na 0.5 HfO 3 , SrZrO 3 and Sb 5+ ) on their phase structure, microstructure, and electrical properties were investigated. The rhombohedral-orthorhombic-tetragonal (R-O-T) phase boundary can be established in the ceramics with 0.03≤x≤0.05, 0.04≤y≤0.06, and 0.01≤z≤0.025, and then their piezoelectric properties were improved. The ceramics with x=0.03, y=0.04 and z=0.01 possess the optimum piezoelectric properties (d 33 =470±5 pC/N, k p =0.51±0.02, andT C =244 o C). We believe that R-O-T multiphase coexistence is mainly responsible for the enhancement of piezoelectric properties.

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