In order to obtain excellent electrical properties and its temperature stability of KNN‐based ceramics to meet the practical applications, a new lead‐free material system of (1−x)K0.5Na0.5Nb0.96Sb0.04O3‐xBi0.5Na0.5Zr0.8Sn0.2O3 (KNNS‐xBNZS, 0 ≤ x ≤ 0.060) was designed, and the enhanced electrical properties (eg, d33 ~ 465 pC/N, εr ~ 3318, Suni ~ 0.133%) is obtained in the ceramics with x = 0.04. The physical origin of enhanced electric properties should be ascribed to the phase instability of R‐T, resulting in a low‐energy barrier, which can greatly facilitate the polarization switching. Moreover, the temperature stable of piezoelectric constant (d33 or d33*) is measured by three distinctive methods in different phase boundaries (O, O‐T, R‐T) at the temperature range 20°C‐180°C, revealing that the O‐T phase boundary has a relatively good temperature stability. A mode is used to show how to effectively modified the piezoelectric constant (d33 or d33*) and its temperature stability, we believe that such a strategy may further improve the temperature stability of d33 or d33* value in KNN‐based ceramics.

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Lead-free piezoelectric ceramics have attracted considerable attention owing to their environmental friendliness and good electrical properties. Here the new (1 À x)K 0.5 Na 0.5 NbO 3 -x(0.15Bi 0.5 Na 0.5 TiO 3 -0.85Bi 0.5 Na 0.5 ZrO 3 ) [(1 À x)KNN-x(BNT-BNZ)] ternary lead-free piezoelectric ceramics synthesized by conventional solid sintering method are reported. The microstructure and electrical properties of (1 À x)KNN-x(BNT-BNZ) ternary ceramics were systematically investigated, and the ceramics with x ¼ 0.06 possess enhanced piezoelectric properties and a high T C (e.g., d