Patent ID: 6187218
Filing Date: 2001-02-13
Classification: C01G,C01P,C04B

Abstract:
A method of producing a Ni--Cu--Zn ferrite material comprising the steps of:providing a mixture of an iron compound powder having a specific surface area of about 8.5 m.sup.2 /g or more, nickel compound powder, copper compound powder and a zinc compound powder, the mixture having a specific surface area of about 8.0 m.sup.2 /g or more;pre-calcining the mixture such that the pre-calcined mixture has a surface area of about 5.0 m.sup.2 /g or more and a spinel crystal synthesizability within a range of about 80.5% to 98%; andmilling the pre-calcined mixture to obtain a Ni--Cu--Zn ferrite material powder having a specific surface area about of 6.0 m.sup.2 /g or more.