Structural and Magnetic Properties of BaFe12-xAlxO19 Prepared by Milling and Calcination

Al substituted barium ferrite particles bafe12-xalxo19 with 0 ≤ x ≤ 0.8 have been prepared by ball milling method. x-ray diffraction (xrd) has shown that the average crystallite size for all samples under investigation is in the range 66 – 76 nm. scanning electron microscopy (sem) imaging indicates that the particle size is in the range 0.2 – 1.0 μm, which demonstrates that the particles are polycrystalline. it was found that al substitution does not significantly change the particle size of bafe12-xalxo19. the magnetic properties have been investigated using a vibrating sample magnetometer, and the anisotropy field is estimated. it was found that the coercivity of the samples increases from 4.2 koe to 6.0 koe with increasing al concentration from x = 0.0 to 0.8 due to the increase in the anisotropy field. interparticle interactions determined from the remnant magnetization data are found to be consistent with a reversal mechanism (demagnetizing like effect) for all samples examined.