Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5490320 | Journal of Magnetism and Magnetic Materials | 2017 | 27 Pages |
Abstract
Ba1âxZnxFe12O19 (0.0â¤xâ¤0.3) hexaferrites were produced via sol-gel auto combustion technique. XRD patterns show that all the samples are single-phase M-type barium hexaferrite (BaM). Scanning electron microscopy (SEM) revealed that grains have a size range of 0.5-2 µm. The magnetic hysteresis (Ï-H) loops revealed the ferromagnetic nature of NPs. The average crystallite sizes were calculated by applying Scherrer equation on the base of XRD powder patterns of all samples and found to be in the range of 16.78-48.34 nm. In particular, Ba1âxZnxFe12O19 (0.0â¤xâ¤0.3) hexaferrites have suitable magnetic characteristics (saturation magnetization in a range of 63.00-67.70 emu/g and coercive field in a range of 822-1275 Oe) for magnetic recording and permanent magnets. Effective crystalline anisotropy constants (Keff) are between 4.20Ã105 and 4.84Ã105 Erg/g. Magnetic moment increased by the substitution of non-magnetic Zn2+ ions. The anisotropy field (Ha) or intrinsic coercivity values above 13255 Oe reveals that all samples are magnetically hard materials. Tauc plots were drawn to specify the direct optical energy band gap (Eg) of NPs. The Eg values are in a narrow range between 1.69 eV and 1.76 eV.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
A. Baykal, I.A. Auwal, S. Güner, H. Sözeri,