Abstarct: In this thesis, we studied the structural, optical, magnetic, electrical and ferroelectric properties of pure and Ni doped-Bismuth ferrite (BiFeO3) samples. The samples were synthesized by microwave method. For characterization of the samples, field emission scanning electron microscope ( ), X-ray diffraction ( ), optical spectroscopy ( ), vibrating sample magnetometer ( ) and meter were used. Un-doped samples were prepared with two sintering temperatures of 500 and 600 and the doped samples were synthesized with different molar percentage of 5%, 10%, 20%, 30%. X-ray diffraction patterns of the samples were shown that the samples have perovskite structure and average crystallite size increase with increasing sintering temperature. Optical studies of the samples were revealed the band gap decreases with increasing of the sintering temperature. The XRD data of the doped samples indicated as Ni dopant increases, the impurity phases also increase. Moreover, the band gap of doped samples decreased with increasing of the dopant. The recorded hysteresis curves of the samples indicated that the Ni doped samples had paramagnetic behavior. Variation of dielectric constants of the samples with frequency revealed that the dielectric constant and dielectric loss decrease with doping. Comparison of the electrical resistance of the samples with temperature was shown the reduction of the electrical resistivity with doping until approximately 20% and then increasing for 30% dopant.