Microstructure and Piezoelectric Properties of 0.95(Na 0.5 K 0.5 )NbO 3 ?0.05SrTiO 3 Ceramics

The 0.95(Na0.5K0.5)NbO3–0.05SrTiO3 (0.95NKN–0.05ST) ceramics formed in this study had a porous microstructure with small grains and low piezoelectric properties due to their low density. However, when a small amount of Na2O was intentionally subtracted from the 0.95NKN–0.05ST ceramics, a liquid phase was formed, which led to increased density and grain size. Piezoelectric properties were also improved for the Na2O-subtracted 0.95NKN–0.05ST ceramics. The increased density and grain size were responsible for the enhancement of the piezoelectric properties. In particular, the 0.95(Na0.49K0.5)NbO2.995–0.05ST ceramics showed high piezoelectric properties of d33=220, kp=0.4, Qm=72, and ɛ3T/ɛo=1447, thereby demonstrating their promising potential as a candidate material for application to lead-free piezoelectric ceramics.

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