Plate-like SrFe12O19 particles prepared by modified sol–gel method

Abstract

M-type strontium hexaferrite powders were synthesized by the modified sol–gel method with calcination in NaCl matrix in a temperature range 790–850°C for 1h. X-ray diffraction analysis shows the formation of pure M-type strontium hexaferrite phase. The SrFe12O19 particles have a plate-like shape with a mean diameter 130–185nm and a thickness 45–55nm. The prepared powders show a saturation magnetization 70–72emu/g and a coercive force 6.0–6.4kOe. The suggested synthesis method combines simplicity, using of low calcination temperatures and allows to synthesize pure strontium hexaferrite powders with excellent hard magnetic properties.