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Acicular γ-Fe2O3 particles surface-coated with barium ferrite

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3 Author(s)
Deng, M.C. ; Dept. of Mater. Sci. & Eng., Tsing Hua Univ., Hsinchu, Taiwan ; Hsu, S.L. ; Chin, T.S.

Acicular γ-Fe2O3 particles surface-coated with barium ferrite (BF) have been prepared by reacting acicular α-FeOOH and surface-absorbed Ba++ at 810 to 890°C followed by reduction-oxidation. The BF-coated γ-Fe2O3 has a diameter of 100 to 200 nm and aspect ratio of 3 to 8, a coercivity of 330 to 3600 Oe, and a saturation and residual magnetization of 47 to 70 and 23 to 34 emu/g, respectively, by controlling the Ba++ concentration and heat treatment temperatures. They have an extremely low temperature coefficient of coercivity of -0.07 to -0.1%/°C. These particles are potentially useful for high-density recording purposes

Published in:

Magnetics, IEEE Transactions on  (Volume:28 ,  Issue: 5 )

Date of Publication:

Sep 1992

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