Production manner null of ferrite magnetic powder raw materials oxide and ferrite magnetic

摘要

PURPOSE: To produce an oxide raw material for Ni-Zn ferrite magnetic powder having fine particle size, uniform shape and composition and high crystallinity while suppressing the formation of impurities. ;CONSTITUTION: An acidic aqueous solution containing Fe²⁺, Ni²⁺, Cu²⁺ and Zn²⁺, containing at least one of the Ni²⁺ and Zn²⁺ in an amount smaller than the total amount necessary for the objective composition and containing Fe²⁺ in an amount larger than the amount to get a spinel-type ferrite is mixed with an alkaline aqueous solution. An oxidizing gas is blown in the mixed solution under agitation to form fine particles. The oxidized mixed solution is incorporated with an aqueous solution containing the remaining part of Ni²⁺, Zn²⁺ and Fe²⁺ to get the above total amounts and an oxidizing gas is blown into the mixture under stirring to effect the oxidation growth of particles.;COPYRIGHT: (C)1996,JPO