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Dielectric properties of cobalt substituted M-type barium hexaferrite prepared by co-precipitation
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Shepherd, Philip, Mallick, Kajal and Green, Roger (2007) Dielectric properties of cobalt substituted M-type barium hexaferrite prepared by co-precipitation. Journal of Materials Science: Materials in Electronics, Vol.18 (No.5). pp. 527-534. doi:10.1007/s10854-006-9059-6 ISSN 0957-4522.
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Official URL: http://dx.doi.org/10.1007/s10854-006-9059-6
Abstract
Barium hexaferrite was synthesised via the co-precipitation method using high purity nitrates, oxides and carbonates of iron (III), barium (II) and ammonium hydroxide. Once a phase pure sample of barium hexaferrite was obtained, it was doped, by weight, with 1, 2, 3, 5, 10, 15, 20 and 30% cobalt oxide (Co3O4). The addition of cobalt to the BaM had the effect of reducing the permittivity and loss tangent until a doping of 10% whereupon it remained constant at around 9. Thermogravimetric (TG) studies of green bodies showed decarboxilation to occur at around 825 degrees C and the transformation of residual Co3O4 to Co2O3 at around 900 degrees C. The X-ray diffraction (XRD) studies confirmed the Co ions substituting in the iron sites until a doping level, of 10-15% where the structure underwent a transition to one more closely resembling the W-type hexaferrite. The measured densities were found to vary with doping levels, with a maximum of 4.45 g/cm(3) at 1% Co doping.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Subjects: | T Technology > TK Electrical engineering. Electronics Nuclear engineering 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 Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group) |
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| Journal or Publication Title: | Journal of Materials Science: Materials in Electronics | ||||
| Publisher: | Springer | ||||
| ISSN: | 0957-4522 | ||||
| Official Date: | May 2007 | ||||
| Dates: |
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| Volume: | Vol.18 | ||||
| Number: | No.5 | ||||
| Number of Pages: | 8 | ||||
| Page Range: | pp. 527-534 | ||||
| DOI: | 10.1007/s10854-006-9059-6 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access |
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