C - Chemistry – Metallurgy – 01 – G
Patent
C - Chemistry, Metallurgy
01
G
31/136
C01G 49/00 (2006.01) C01G 51/00 (2006.01) C01G 53/00 (2006.01)
Patent
CA 1252995
Abstract The method disclosed by which to prepare fine hexag- onal ferrites for use in magnetic recording, is one which consists basically in dissolving a) carbonates or other soluble compounds of an aikaline earth metal such as strontium or barium, b) a carbonate or other soluble compound of cobalt, and c) titanium trichlor- ide, all in a solution of ferric citrate and water, whereupon a polycondensation is brought about by ad- dition of ethylene clycol, and heat is applied to eliminate 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 ReO . (6-x)Fe2O3 . xCoO . xTiO2 where x is the extent to which cobalt and titanium atoms replace iron atoms and Re is the alkaline earth metal. Final application of heat produces crystalliz- ation of the superfine hexaferrite particles.
495813
Besagni Tullo
Licci Francesca
Rinaldi Stefano
Consiglio Nationale Delle Ricerche
Shapiro Cohen
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