The 0.8Pb(Zr_0.48Ti_0.52)O₃ – 0.125Pb(Zn_1/3Nb_2/3)O₃ – 0.075Pb(Mn_1/3Nb_2/3)O₃ + x wt% Fe₂O₃ ceramics (PZT-PZN-PMnN), where x = 0 ÷ 0.35, has been prepared by two-stage calcination method. The effect of Fe₂O₃ content on the crystal structure and electrical properties of ceramics has been investigated. The results of X-ray diffraction (XRD) show that all samples have pure perovskite phase with tetragonal structure, the c/a ratio increases with increasing Fe₂O₃ content. At x = 0.25, electrical properties of ceramics are best: the density (r) of 7.86 g/cm³, the electromechanical coupling factor (k_p) of 0.64, the dielectric constant (ε_r) of 1400, the dielectric loss (tand) of 0.003, the mechanical quality factor (Q_m) of 1450, the piezoelectric constant (d₃₁) of 155 pC/N, and the remanent polarization (P_r) of 37 μC/cm², which makes it as a promising material for high power piezoelectric devices.