Abstract
In this paper, end members of tetragonal phase (Na0.535K0.485)0.905Li0.095(Nb0.94Ta0.06)O3(abbreviated as NKLN) and rhombohedral phase (Na0.5Bi0.5)TiO3(abbreviated as NBT) were used to fabricate dense (1-x)NKLN-xNBT (x=0, 0.005, 0.01, 0.02, 0.03, 0.04) lead-free piezoelectric ceramics. By increasing the NBT content x value, the crystalline structure changes from tetragonal phase to rhombohedral one across a morphotropic phase boundary (MPB) composition of x=0.02. In this MPB composition, enhanced electrical properties were obtained as follows: piezoelectric constant d33=202 pC/N, planar electromechanical coupling coefficient kp=39.6%, relative dielectric constant εr=1020 and dielectric loss tgδ=2.67%, indicating that this ceramic was a promising lead-free piezoelectric material for practical applications.
Published Version
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