化学的共沈法並びに熱処理によるSr-Mフェライト微粒子の磁気特性

第2報

抄録

This experiment was carried out to investigate the new process of the preparation of fine particles of SrO⋅6Fe₂O₃ with single phase by controlling the chemical coprecipitation(a solution containing Fe³⁺ and Sr²⁺ in the ratio 10.0-12.0) and succeeding heat treatment. The new process is performed with successive as follows ; coprecipitation→boiling→drying→heat treatment. The conventional process was characterized by the washing after the coprecipitation. The conditions determined as optimum for preparing the fine powders with best values of σ_s= 90.5 × 10^-6 Wb⋅m/kg, H_cJ=350.1kA/m, average anisotropy field H_Aavc=915.1 kA/m and T_c= 464°C are as follows: solution composition ; Fe³⁺/Sr²⁺=10.5 ; pH=13.0 ; heat treatment ; 1000°C for 2hs in air.