Chemical Synthesis of Highly Magnetic, Air-Stable Silica-Coated Iron Particles

Highly magnetic and air-stable silica-coated Fe particles have been prepared by a rapid and simple method. The specific magnetization of the sample can be as high as 201 Am²/kg even including silica, which is a non-magnetic material. The iron particle coated with silica is passivated and protected from oxidation. The influences of H₂ reduction temperature on structure and magnetic properties are also studied.