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Preparation and magnetic properties of barium ferrite fine particles by the coprecipitation salt-catalysis method

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3 Author(s)
Sakai, H. ; Showa Denko KK, Shiojiri, Nagano, Japan ; Hanawa, K. ; Aoyagi, K.

The authors describe catalytic action by NaCl in the reaction between α-Fe2O3 and BaCO3 and the development of a new process for manufacturing barium ferrite fine particles. Pure α-FeOOH and reagent-grade BaCO3 are mixed and heated at temperatures from 300 to 800°C with and without NaCl. The BaCO3 and α-Fe2O3 powders which are formed during heating react and change to barium ferrite at temperatures 100°C lower than NaCl than without it. A hematite defect structure is maintained up to a relatively high temperature due to the presence of the salt, which promotes the formation of barium ferrite. The manufacturing process involves mixing an aqueous solution of metallic chlorides with a mixture of NaOH and Na 2CO3. This alkaline coprecipitate slurry is then neutralized by HCl solution, filtered, and dried. The dried powder, containing salts produced by the reaction, is heated at 840°C. After the salts are dissolved in water, barium ferrite fine particles are obtained

Published in:

Magnetics, IEEE Transactions on  (Volume:28 ,  Issue: 6 )

Date of Publication:

Nov 1992

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