Abstract
Ba-La-Co M-type ferrite fine particles were prepared by mechanical compounding (M.C.) method using the planetary ball-mill and subsequent heat treatment. Experiments were carried out to investigate the effects of La2O3 and Co3O4 addition on the magnetic properties of Ba system M-type ferrite fine particles prepared by M.C. method. The optimum conditions for making M-type ferrite fine particles and some properties are as follows. Chemical composition: BaO·6.2Fe2O3 with addition of 2wt%La2O3 and 0.3wt%Co3O4, planetary ball-mill condition: 300rpm x 1h and heat treatment condition: 1150 °C x 1h in air. Typical magnetic and physical properties of the obtained powders are os=85.7×10-6Wb·m/kg, HcJ=414kA/m, Tc=450.5°C, and average particle size of 0.25μm.
