Piezoelectric Properties of (1− x )(Na 0.5 K 0.5 )NbO 3 – x AgSbO 3 Lead‐Free Ceramics

(1− x )(Na 0.5 K 0.5 )NbO 3 – x AgSbO 3 lead‐free piezoelectric ceramics were prepared by normal sintering. The effects of the AgSbO 3 on the phase structure and piezoelectric properties of the ceramics were systematically studied. These results show that the AgSbO 3 ‐modified (K 0.50 Na 0.50 )NbO 3 lead‐free piezoelectric ceramics form stable solution with orthorhombic structure, and the Curie temperature and the polymorphic phase transition of the ceramics decreased with increasing AgSbO 3 . The result shows that the piezoelectric properties of the ceramics strongly depend on the AgSbO 3 . The ceramics with x =0.05 possess optimum properties ( d 33 =192 pC/N, k p =43%, T c =348°C, T o−t =145°C, ɛ r ∼632, and tan δ∼3.5%). These results indicate that the ceramic is a promising candidate material for lead‐free piezoelectric ceramics.