Abstract
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.
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