Magnetic Properties of Sr-M Ferrite Powders Prepared by Mechanical Alloying Method

Abstract

This experiment was carried out to investigate the magnetic properties of Sr-M ferrite powders prepared by mechanical alloying method. The samples of SrO•nFe₂O₃ where n was varied between 6.0 and 4.0 were mechanically alloyed for 1-40hs. The mechanically alloyed powders were heat-treated at 700-1200°C for 1h in air. The optimum condition of preparing the single phase of powders with suitable properties was as follows: compositlon: SrO•4.5Fe₂O₃, mechanical alloying time: 5hs, heat-treatment condition: 1100°C×1h in air, the magnetic properties are σ_s=7.97×10^-5Wb•m/kg (63.46emu/g), σ_r=4.20×10^-5Wb•m/kg (33.96emu/g), H_cJ=401.87kA/m(5.O5kOe).