Abstract Number: 634 Working Group: Nanoparticles and Materials Synthesis
Abstract Research on a"-Fe16N2 has attracted tremendous attention both for fundamental research and for the application to giant magnets—the high density of magnetic recording devices and the life science study of alternatives for rare earth magnetic materials. In the present study, we intended to prepare a"-Fe16N2 nanoparticles with a core-shell structure (coating an Al2O3 layer onto the surface of a"-Fe16N2 nanoparticles) to avoid the lateral interaction between magnetic nanoparticles along with a retardation of the oxidation of the a"-Fe16N2 nanoparticles. By using a fluid-bed method, the a"-Fe16N2 nanoparticles were synthesized directly via ammonia gas nitriding of alumina-coated spherical a-Fe nanoparticles that were uniquely prepared in one step using a Radio Frequency induction thermal plasma. We also used X-ray absorption fine structure analysis, which to the best of our knowledge has not been used in the characterization of iron nitride. Magnetic properties analysis is also reported in this paper. The implantation of nitrogen into the iron nanoparticles to constitute the a"-Fe16N2 structure showed a great effect on the production of rare-earth-free giant magnetization materials.