On the Temperature Dependency of Initial Permeability for Ni-Zn Ferrites

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• The temperature dependency of initial permeability for Ni-Zn ferrites is required to be made as small as possible, when the ferrites are used in electronic components. The present paper describes a method to improve the temperature dependency of the initial permeability for Ni-Zn ferrites.Initial permeability μ0 is represented in terms of saturation magnetization; IS, magneto-striction; λS, internal stress; σ, and magnetic anisotropy; K, μ0∞IS2/λSσ+|K|Since IS, λS, σ and K have temperature dependency, initial permeability varies with temperature.Authors, therefore, studied the relation between temperature dependency of μ0 and heat-treatment of ferrite which was given to obtain different K or λSσ.The composition of studied ferrites are (NiO)0.3(ZnO)0.2(Fe2O3)0.5 and (NiO)0.35(ZnO)0.15(Fe2O3)0.5. These oxides were fired at a temperature between 1150°C and 1275°C after calcining at various temperatures.Experimental results obtained were as follows:(1) Small temperature factor of μ0 was not obtained only by changing conditions of heat-treatment.(2) Specimens of Ni-Zn ferrite in which Co-ferrites was dissolved show various; μ0-T relations as the heat-treatment or Co-ferrite content varies.(3) To minimize temperature dependency of μ0 at a temperature range of -30°C-+50°C, 1-1.25mol% of Co-ferrite must be dissolved in Ni-Zn ferrite.(4) As the temperature dependency of μ0 for Ni-Zn ferrites in which Co-ferrites was dissolved is varied by varying the calcining and firing temperature, the condition of heat-treatment for these ferrites must always be considered carefully.

• 社団法人 日本材料学会の論文

社団法人 日本材料学会 | 論文

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