Full set of material constants of (Na0.5K0.5)NbO3-BaZrO3-(Bia0.5Li0.5) TiO3 lead-free piezoelectric ceramics at the morphotropic phase boundary

The perovskite solid solution system of (1-x-y)(Na0.5K0.5)NbO3-xBaZrO(3)-y(Bi0.5Li0.5)TiO3 (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. 43, rand, 41, cl33, d15, Qm and Tc are 2496, 0.025, -159 pC/N, 321 pC/N, 602 pC/N, 44 and 256 degrees C, respectively. The piezoelectric properties are not only superior to those of other (Na,K)Nb03-based ceramics at room temperature, but also relatively stable against temperature up to 200 degrees C. These results show that BZ/BLT/NKN solid solution is a promising candidate for practical piezoelectric applications in actuating and sensing fields. (C) 2015 Elsevier B.V. All rights reserved.