化学的共沈法によるSr-La-Co系M形フェライト微粒子の磁気特性

概要

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Single phase Sr-La-Co M-type ferrite fine particles were prepared by the chemical coprecipitation and subsequent heat treatment. The chemical reagents used for an experiment are FeCl3⋅6H2O, Sr(NO3)2, La(NO3)3⋅6H2O, Co(NO3)2⋅6H2O and CoCl2·6H2O. The chemical coprecipitation composition were chosen according to the formula {(SrO)·n/2(Fe2O3)}100-x-y(La2O3)x(CoO)y, where n was fixed at 7.0 and x at 1.5 and y was varied between 1.0 and 10.0. A water solution containing Sr2+, Fe3+, La3+ and Co2+ was poured into solution of NaOH (pH=13.0). Aqueous suspensions containing the coprecipitated products were boiled for 2h, and they were carefully washed, filtrated and dried at 80°C for 12h. The obtained fine particles were heated 950 to 1100°C for 2h in air to get single phase Sr-La-Co M-type ferrite fine particles. The conditions determined as optimum for preparing the fine particles with the best values of σs=90.2×10-6 Wb·m/kg (71.8emu/g), σr=45.1×10-6 Wb·m/kg (35.9emu/g), Hcj=525.2kA/m (6.60kOe) and Tc=453.9°C are as follows: composition; Sr2+0.812La3+0.045Co2+0.045Fe3+9.236O2-19; heat treatment; 1000°C×2h in air, the average particle size; 0.3-0.4μm.
社団法人粉体粉末冶金協会の論文
2000-02-15