MAGNETITE PARTICLES

摘要

An object of the invention is to provide magnetite particles which have a high coercive force and therefore suppress fog when used in magnetic toners, have reduced environmental burdens, and are produced economically and to provide a process of producing the magnetite particles. The magnetite particles of the invention contain 0.1 to 1% by mass of phosphorus, have a coercive force of 10 to 25 kA/m in an applied magnetic field of 796 kA/m, and have an octahedral shape.