abstract |
Magnetic gamma-Fe2O3 particles particularly useful as magnetizable material for magnetic recording media, area produced by treating alpha-FeOOH particles with a solution of a hydrolysis-resistant, inorganic substance capable of forming on the alpha-FeOOH particles a firmly adhering covering, so that the individual alpha-FeOOH particles will be substantially covered by such substance, and by converting the thus pretreated alpha-FeOOH particles into gamma-Fe2O3. |