Abstract
Submicron sized particles of M-type Sr-ferrite were obtained from fine Fe2O3 and precipitated SrCO3. The particles with the size smaller than 1.0μm were observed by SEM, and the average size was about 0.3 μm. The magnetic properties of the powder were σs=7lemu/g and HcJ=5.5kOe. By means of dry vibrating milling, HcJ of the powder was reduced to 40% of initial value, aild the temperature dependence of Hcj (ΔHcJ/ΔT) was also reduced to less than 30%. Lattice distortion value of the milled powder was investigated by XRD. Lattice strain as well as crystallite size were calculated respectively using the method of Warren and Averbach. It was found that the strain of (206) plane is closely related to HcJ of the powder.
