Magnetic properties of Sr-ferrites synthesized in molten ( NaCl + KCl ) flux

The Sr-ferrite powders, SrFe 12 O 19 , were synthesized by the molten salt method using ( NaCl + KCl ) mixture. Particle morphology was homogeneous and hexagonal platelet like. Both particle size and thickness increased as the reaction temperature and time increased. The sintering density of Sr-ferrite magnet prepared with powders by the molten salt method showed the maximum value at the sintering temperature of 1200 ∘ C . The magnetic properties of the Sr-ferrite magnet were investigated with various sintering temperatures. The maximum values of remanent magnetization ( σ r , 45 emu/g) and coercivity field ( H c j , 298 kA/m) occurred at the sintering temperatures of 1150– 1200 ∘ C . The Sr-ferrite magnet by a molten salt method showed higher remanent magnetization and coercivity field than those of the Sr-ferrite magnet prepared with the same starting materials by a conventional ceramic process.