Publications

Ba1-xBixFe12O19 nanoparticles (0 ≤ x ≤ 0.1) were prepared by the chemical co-precipitation method. The structure and morphology of the samples were revealed using powder X-ray diffraction (XRD) and transmission electron microscope (TEM). Both XRD and TEM confirm the synthesis of hexagonal Hexaferrites in the nanoscale, with average crystallite size in the range of 16.5–41.2 nm. Moreover, the octahedral ion-oxygen and tetrahedral ion-oxygen vibration bands were detected by FTIR analysis. Furthermore, the hard magnetic properties of the ferrimagnetic nanoparticles were investigated by analyzing room temperature magnetic hysteresis (M –H). Bi3+ substitution has caused an enhancement in the saturation magnetization by 20% and a reduction in the coercivity field by 50% relative to the pure sample. The maximum energy product (BH)max was enhanced by 37%. The effective crystalline isotropy constant and the anisotropy field showed an increase with Bi3+ substitution. The changes in the magnetic parameters are correlated to the changes in the structural parameters induced by Bi3+ substitution.