PROCESS FOR PRODUCING BARIUM FERITE PARTICLES

摘要

Barium ferrite particles suitable for magnetic recording media are produced by autoclaving an alkaline suspension contg. α -FeO (OH) particles of a specific surface area 10-25 m2/g and Ba ions at 250- 360≦̸C. The α -FeO (OH) particles have an apparent density not more than 0.08 g/cm3 and a tap density not more than 0.2 g/cm3. The Ba ferrite particles are useful for use in perpendicular recording tapes.