Ni-Zn系フェライトの初透磁率の温度変化について

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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 μ_0 is represented in terms of saturation magnetization ; I_S, magneto-striction ; λ_S, internal stress ; σ, and magnetic anisotropy ; K, [numerical formula] Since I_S, λ_S, σ and K have temperature dependency, initial permeability varies with temperature. Authors, therefore, studied the relation between temperature dependency of μ_0 and heat-treatment of ferrite which was given to obtain different K or λ_Sσ. The composition of studied ferrites are (NiO)_<0.3>(ZnO)_<0.2>(Fe_2O_3)_<0.5> and (NiO)_<0.35>(ZnO)_<0.15>(Fe_2O_3)_<0.5>. These oxides were fired at a temperature between 1150℃ and 1275℃ after calcining at various temperatures. Experimental results obtained were as follows : (1) Small temperature factor of μ_0 was not obtained only by changing conditions of heat-treatment. (2) Specimens of Ni-Zn ferrite in which Co-ferrites was dissolved show various μ_0-T relations as the heat-treatment or Co-ferrite content varies. (3) To minimize temperature dependency of μ_0 at a temperature range of -30℃〜+50℃, 1〜1.25 mol % of Co-ferrite must be dissolved in Ni-Zn ferrite. (4) As the temperature dependency of μ_0 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
1961-06-15

Ni-Zn系フェライトの初透磁率の温度変化について

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