| 초록 |
Iron nitride (α”-Fe16N2) has been attention to rare-earth free permanent magnet candidate due to its abundant amount of Fe source, large magnetocrystalline anisotropy, and large saturation magnetization. Many researchers have attempted the various synthesis methods such as wet chemical, ball milling and plasma process etc.Wet chemical or plasma based synthesis enable to fabricate fine powders with the size below than 100 nm. However, the resulting particles still exhibit low coercivity as compared to theoretical values. It might be attributed to intensive surface oxidation of the particle surface or aggregation of nanoparticles. Herein, α“-Fe16N2@SiO2 nanoparticles were synthesized by hydrothermal synthetic process combined with sol-gel based coating, followed by hydrogen reduction and ammonia nitridation. Thus, the fabrication of air-stable α”-Fe16N2 nanoparticles will provide opportunities to realize practical Fe based permanent magnets. |
