Abstract
AbstractHigh inverse piezoelectric coefficients are crucial for the effective use of piezoelectric ceramics as actuators. In this study, we focused on the design and preparation of (K0.5−xNa0.5−xSrx) (Nb0.8Ta0.2)O3 (x = 0, 0.01, 0.02, 0.03) by defect engineering and investigated the effect of Sr2+ doping on its electrical properties. The results showed that a single perovskite phase can be achieved when Sr2+ doping is less than 3 mol%. Furthermore, Sr2+ doping was found to cause a linear decrease in both the Curie temperature (TC) and the orthorhombic–tetragonal phase transition temperature (TO‐T). The ceramic with x = 1% showed optimal piezoelectric properties, exhibiting an electric field‐induced strain of 0.124% under a low driving electric field of 20 kV/cm. This corresponds to an inverse piezoelectric coefficient () of 620 pm/V, which is comparable to that of commercial PZT piezoelectric ceramics. This study not only provides potential piezoelectric ceramics for actuators but also serves as a reference for developing high‐performance piezoelectric ceramics.
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