No abstract

FeSi/SiO2 Core-shell nanoparticles were synthesized by DC arc-discharge approach and annealing process. The products were characterized by SEM, TEM, EDX, XRD and VSM. As-prepared FeSi/SiO2 Core-shell nanoparticles have the diameter of 40-100 nm and the thickness of the SiO2 shell is about 20 nm. The growth mechanism based on the crystallographic and thermodynamic theory was explained. Magnetic characterization was carried out and the results showed that the FeSi/SiO2 Core-shell nanoparticles exhibited superparamagnetism characteristic at room temperature.