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Magnetic and structural properties of M-type barium hexaferrite prepared by co-precipitation
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Shepherd, Philip, Mallick, Kajal and Green, Roger (2007) Magnetic and structural properties of M-type barium hexaferrite prepared by co-precipitation. Journal of Magnetism and Magnetic Materials, Vol.311 (No.2). pp. 683-692. doi:10.1016/j.jmmm.2006.08.046 ISSN 0304-8853.
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Official URL: http://dx.doi.org/10.1016/j.jmmm.2006.08.046
Abstract
Stoichiometric and single-phase barium hexaferrite (BaM) has been synthesized by co-precipitation and an additional solid state preparative method using high-purity nitrates, oxides and carbonates of iron (111), barium (11) and ammonium hydroxide. The isochronally and isothermally measured permeability and magnetic loss tangents over 1 MHz-1 GHz in frequency remained moderately constant until a sintering temperature of 1300 degrees C where relative permeability of 1.3 and loss tangent of 0.06 at 1 GHz, indicate high-frequency magnetic characteristics for BaM. TGA/DTA studies showed the hexaferrite formation temperature was found to be 1050 degrees C. The apparent densities before and after each firing cycle showed a monotonic increase. X-ray diffraction studies established the presence of a single phase with the theoretical space group P63/mmc, and computed cell parameters of a = b = 5.895 angstrom and e = 23.199 angstrom. The samples exhibited a Curie point (T-c) of 452 degrees C and displayed ferromagnetic resonance characteristics centred on a frequency of 500 MHz. (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: | April 2007 | ||||
| Dates: |
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| Volume: | Vol.311 | ||||
| Number: | No.2 | ||||
| Number of Pages: | 10 | ||||
| Page Range: | pp. 683-692 | ||||
| DOI: | 10.1016/j.jmmm.2006.08.046 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access |
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