Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8152589 | Journal of Magnetism and Magnetic Materials | 2018 | 5 Pages |
Abstract
The effects of additives Bi2O3 and MnCO3 on the structural and magnetic properties of M-type Sr-hexaferrites (SrFe12O19) prepared by a conventional solid-state reaction method were studied. The saturation magnetization value of undoped SrFe12O19 is 71.8â¯emu/g; it increases to 72.6â¯emu/g and 74.2â¯emu/g with Bi2O3 doping of 0.5â¯wt%and 1.0â¯wt%, respectively. However, abnormal grain growth occurs and the coercivity (HC) decreases significantly in the 1â¯wt% Bi2O3-doped sample. Co-doping of 0.5â¯wt% Bi2O3â¯+â¯0.5â¯wt% MnCO3 is effective, because a higher saturation magnetization (73.1â¯emu/g) than that of undoped SrFe12O19 could be achieved with a relatively large coercivity of â¼3.3â¯kOe. Based on the lattice parameter calculation, Bi3+ preferably substitutes into Fe3+ sites rather than Sr2+ sites in M-type Sr-hexaferrite. The enhanced saturation magnetization can be attributed to the selective substitution of nonmagnetic Bi3+ into the down-spin Fe3+ site (4f1 or 4f2).
Related Topics
Physical Sciences and Engineering
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Condensed Matter Physics
Authors
Eun-Soo Lim, Kwang-Rok Mun, Young-Min Kang,