Abstract: Fe-doped leadless piezoelectric ceramics Bi_0.5(Na_0.825K_0.175)_0.5TiO₃+xFe₂O₃（x=0,0.1%,0.3%,0.5%,0.7%,1.0%,1.5%) （abbreviated as BNKTF-x,x is the mass fraction of Fe₂O₃) was prepared by the conventional solid phase technique.Structure and dielectric and piezoelectric properties of BNKTF-x system were analyzed by means of X-ray diffraction(XRD),SEM,and electric measurement device etc..XRD results showed that the ceramics presented a monophase perovskite structure when mass fraction of Fe was less than 1.0% and the sample was sintered at 1 180 ℃ for 2 h.All the ceramic crystal grains mostly were tetragonal with clear boundaries.Increase of Fe could promote the growth of grains.Additionally,introduction of Fe reduced the porosity of ceramic sample and the ceramics had the best compactness when mass fraction of Fe was about 0.3%.Measurements of piezoelectric and dielectric properties showed excellent electrical properties of BNKTF-0.1% ceramics:d₃₃=145 pC/N,k_p=0.28,ε_r=869,tanδ=0.032,and Q_m=106.

Key words: BNKTF-x, leadless piezoelectric ceramics, electrical properties