| 摘要 |
PROBLEM TO BE SOLVED: To provide the production method for obtaining a spinel type ferrite material having a fine grain size after preliminary burning, to eliminate grinding/drying stages before normal burning and to simplify a stage by using the spinel type ferrite material. SOLUTION: The fine particles of this spinel type ferrite material having 3-10 m<2> /g specific surface area are obtained by mixing Fe3 O4 with at least one kind selected from the group of NiO, ZnO, CuO, MgO and MnO2 to obtain a main component, and mixing a chloride starting material and at least one kind of V2 O5 , PbO and Bi2 O3 being an oxide starting material into the main component and executing the preliminary burning at 500-700 deg.C. In this way, the grinding/drying stages being the post stage is eliminated, and the number of stages is reduced than heretofore. |
