Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8157574 | Journal of Magnetism and Magnetic Materials | 2014 | 7 Pages |
Abstract
We have accomplished a low temperature sol-gel synthesis of nanocrystalline M-type hexaferrites BaCoxZrxFe(12â2x)O19 (x=0, 0.2, 0.4, 0.6, 0.8 and 1.0). These compounds were characterized by TGA-DTA, FT-IR, XRD, EDS and TEM. X-ray diffraction patterns demonstrate that the compounds are single phase M-type barium hexagonal ferrites (BHF) and maximum substitution is attained at x=1.0. The average size of the hexagonal platelets is 41.62Â nm. MS is employed to probe the magnetic properties at microscopic levels. MS studies suggest that both the nature and concentration of dopant ions control site preferences in the crystal lattice. Substitution is preferred at 4f2 and 2b sites at x=0.4, 4f1 and 4f2 sites at x=0.6 and 2a and 2b sites at x=1.0 levels. M vs H studies reveal that on substitution MS vary only slightly from 63.63 to 56.94Â emu/g while a drastic reduction has been observed in HC from 5428 to 630Â Oe. High MS and low HC values of these materials make them particularly suitable for application in data recording. Our results also show that HC can be monitored independently while retaining high saturation magnetization of BHF by making coupled substitution of divalent (Co2+) and tetravalent (Zr4+) cations for Fe3+ ions.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
S.K. Chawla, R.K. Mudsainiyan, S.S. Meena, S.M. Yusuf,