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Magnetic properties of cobalt substituted M-type barium hexaferrite prepared by co-precipitation
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Mallick, Kajal, Shepherd, Philip and Green, Roger (2007) Magnetic properties of cobalt substituted M-type barium hexaferrite prepared by co-precipitation. Journal of Magnetism and Magnetic Materials, Vol.312 (No.2). pp. 418-429. doi:10.1016/j.jmmm.2006.11.130 ISSN 0304-8853.
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Official URL: http://dx.doi.org/10.1016/j.jmmm.2006.11.130
Abstract
The co-precipitation and solid state methods were used in the synthesis of barium hexaferrite (BaM). Phase pure BaM was obtained with 1, 2, 3, 5, 10, 15, 20 and 30wt% cobalt oxide (Co3O4). The addition of Co2+/3+ ions to the BaM increased the permeability and magnetic loss tangent to a value of 3.5 at 5% and reduced to I at 30% doping. With increased Co doping, M-s was reduced from 8758 emu/g, M-r increased from I I to 40 emu/g with 3-5 wt% Co and 9 emu/g for 30% doping. H, sharply increased from 540 to 2200 Oe with a reduction to 280 Oe at 10 K with increasing temperature to 300 K. T-c increased from 740 to 750 K for 30% Co doping. DTA-TGA studies of green body showed decarboxilation to occur at around 825 degrees C and the transformation of residual Co3O4 to Co2O3 at around 577 degrees C. The XRD data confirmed the Co ions substituting into Fe sites until a 10-15% doping level where the structure altered to W-type hexaferrite. The densities of the compounds varied with doping to a maximum of 4.45 g/cm(3) (c) 2006 Elsevier B.V. All rights reserved.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) Q Science > QC Physics |
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| Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | ||||
| Journal or Publication Title: | Journal of Magnetism and Magnetic Materials | ||||
| Publisher: | Elsevier Science BV | ||||
| ISSN: | 0304-8853 | ||||
| Official Date: | 11 May 2007 | ||||
| Dates: |
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| Volume: | Vol.312 | ||||
| Number: | No.2 | ||||
| Number of Pages: | 12 | ||||
| Page Range: | pp. 418-429 | ||||
| DOI: | 10.1016/j.jmmm.2006.11.130 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access |
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