Synthesis of Ultrafine Grain Ferrites

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Abstract
Methoxides of nickel(II) and iron(III) were synthesized, mixed in the ratio to form NiFe 2 O 4 , aerosolized, hydrated, and then fired in a streamline tubular reactor. Submicrometersized spherical particles were obtained from pyrolysis at temperatures up to 570°. At 425°, the sudden loss of volatiles shattered the particles to much smaller spheres (with 30% less than 0.1 μm) giving a remarkable increase in surface area. Pyrolysis up to 570° caused a gradual increase in the powder density toward that of NiFe 2 O 4 . Heating the aerosol product up to just 600° with a heating rate of 5°/min yielded pure crystalline nickel ferrite.

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