Method for the preparation of fine hexagonal ferrite powders, in

Compositions – Magnetic – Iron-oxygen compound containing

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252 6256, 252 6264, 148 14, 148100, 264125, C04B 3526

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active

046221590

ABSTRACT:
The method disclosed by which to prepare fine hexagonal ferrites for use in magnetic recording, is one which consists basically in dissolving (a) carbonates or other soluble compounds of an alkaline earth metal such as strontium or barium, (b) a carbonate or other soluble compound of cobalt, and (c) titanium trichloride, all in a solution of ferric citrate and water, whereupon a polycondensation is brought about by addition of ethylene clycol, and heat is applied to eliminate the water and organic matter from the compound. Addition of the alkaline earth metal, the cobalt and the titanium is proportioned precisely on the basis of the stoichimetric properties of the end-product, the formula for which is

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