Full set of material constants of (Na0.5K0.5)NbO3–BaZrO3–(Bi0.5Li0.5)TiO3 lead-free piezoelectric ceramics at the morphotropic phase boundary

Abstract The perovskite solid solution system of (1−x−y)(Na 0.5 K 0.5 )NbO 3 –xBaZrO 3 –y(Bi 0.5 Li 0.5 )TiO 3 (BZ/BLT/NKN) is a new family of lead-free piezoelectric material. Compositions near the morphotropic phase boundary (MPB) (x = 0.06, y = 0.02) have been reported to have good piezoelectric coefficients with the moderate Curie temperature. In this work, the full set of material constants for the MPB composition of BZ/BLT/NKN solid solution was characterized using the resonance method. e 33 T , tan δ , d 31 , d 33 , d 15 , Q m and T C are 2496, 0.025, −159 pC/N, 321 pC/N, 602 pC/N, 44 and 256 °C, respectively. The piezoelectric properties are not only superior to those of other (Na,K)NbO 3 -based ceramics at room temperature, but also relatively stable against temperature up to 200 °C. These results show that BZ/BLT/NKN solid solution is a promising candidate for practical piezoelectric applications in actuating and sensing fields.