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Ca0.5Sr0.5TiO3-Modified KNN-Based Lead-Free Piezoceramics with a Wide Temperature Usage Span

The strong temperature dependence of dielectric and piezoelectric properties is a big ‘bottleneck’ for practical applications of KNN-based piezoceramics. In order to resolve this problem, Ca0.5Sr0.5TiO3 (CST) is doped into (Na0.53K0.407Li0.063)Nb0.937Sb0.063O3 (NKLNS) ceramics. The thermal stability of sE11 and k31 in the temperature range from −50°C to 200°C for ceramics with 1.0 and 1.5 mol% CST is raised in comparison with ceramics without CST. Ceramics with 1.5 mol% CST exhibit high piezoelectric properties (d33 = 202 pC/N, kp = 44%) and low dielectric loss (2%) at room temperature. The excellent piezoelectric properties, which are comparable to conventional PZT ceramics, indicate that these ceramics are promising candidates for lead-free piezoelectric applications.