Synthesis and electromagnetic properties of nanodendritic γ′-Fe₄N

Nanodendritic [Formula: see text]-Fe₄N was successfully synthesized through a nitriding process from dendritic [Formula: see text]-Fe₂O₃, which was prepared by hydrothermal method using potassium ferricyanide (K₃[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 [Formula: see text]-Fe₂O₃ to [Formula: see text]-Fe₄N by controlling the nitriding temperature, duration and nitrogen potential precisely. The dendritic [Formula: see text]-Fe₄N has the saturation magnetization of 146[Formula: see text]emu/g and the coercive force of 94[Formula: see text]Oe at 300[Formula: see text]K. The maximum reflection loss is [Formula: see text][Formula: see text]dB at 3[Formula: see text]GHz with the thickness of 3.0[Formula: see text]mm for the composite sample.