Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 539, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jmmm.2021.168413
Keywords
BaFe12O19 nanoparticles; Bi3+ substitution; Hard magnetic materials; Permanent magnet
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Ba1-xBixFe12O19 nanoparticles were synthesized by chemical co-precipitation method, showing hexagonal structure with small crystallite size. FTIR analysis detected specific vibration bands. Bi3+ substitution enhanced magnetic properties while inducing changes in structural parameters.
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.
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