Synthesis and electromagnetic properties of nanodendritic gamma '-Fe4N

摘要

Nanodendritic gamma'-Fe4N was successfully synthesized through a nitriding process from dendritic alpha-Fe2O3, which was prepared by hydrothermal method using potassium ferricyanide (K-3[Fe(CN)(6)]) as iron source. The structure and electromagnetic properties of this material were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), vibrating sample magnetometer (VSM) and vector network analyzer (VNA). The results revealed that the dendritic morphology can be mostly inherited from alpha-Fe2O3 to gamma'-Fe4N by controlling the nitriding temperature, duration and nitrogen potential precisely. The dendritic gamma'-Fe4N has the saturation magnetization of 146 emu/g and the coercive force of 94 Oe at 300 K. The maximum reflection loss is -12 dB at 3 GHz with the thickness of 3.0mm for the composite sample.