Magnetic properties of barium ferrite synthesized using a microemulsion mediated process

Ultrafine barium ferrite particles have been synthesized using a microemulsion mediated process. The aqueous cores (typically 10–25 nm in size) of water-in-oil microemulsions were used as constrained microreactors for the precipitation of precursor carbonates of Ba 2+ and Fe 3+. These precursors (5–...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 1992-10, Vol.116 (3), p.L299-L304
Main Authors: Pillai, Vinod, Kumar, Promod, Shah, D.O.
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Domain effects, magnetization curves, and hysteresis
Exact sciences and technology
Magnetic properties and materials
Physics
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Summary:Ultrafine barium ferrite particles have been synthesized using a microemulsion mediated process. The aqueous cores (typically 10–25 nm in size) of water-in-oil microemulsions were used as constrained microreactors for the precipitation of precursor carbonates of Ba 2+ and Fe 3+. These precursors (5–15 nm in size) when heated at 950°C, transformed to the hexagonal ferrite BaFe 12O 19 as confirmed by X-ray diffraction. This barium ferrite powder had an intrinsic coercivity of 5089 Oe and a saturation magnetization of 60.1 emu/g.
ISSN:0304-8853
DOI:10.1016/0304-8853(92)90105-W