COATED ACICULAR FINE PARTICULATE MATERIALS, PROCESSES FOR PREPARING SAME AND USE THEREOF

摘要

An acicular fine particulate material which is coated with a compound containing at least one element selected from among elements of Groups III and IV of the Periodic Table in Periods 5 and 6, the acicular fine particulate material being one of (i ) an acicular fine particulate material containing iron carbide, (ii ) an acicular fine particulate material containing iron carbide, metallic iron and carbon, and (iii ) an acicular fine particulate metallic iron containing carbon, is prepared by a promoted reduction reaction while being effectively prevented from sintering and consequently affords magnetic recording media having a high recording density.