Preparation of Fe 2Ni 2N and investigation of its magnetic and electromagnetic properties

Abstract

In this work, Fe 2Ni 2N powders were prepared by calcinating a nanofiber-like precursor in flowing ammonia. It was found that the nitridation temperature is critical to controlling the phase composition of the target products, and the single-phased Fe 2Ni 2N with high saturation magnetization is obtained after calcinations of the precursor at 800 °C in flowing ammonia. Dielectric permittivity and magnetic permeability of paraffin composites having 50 and 70 wt. filler amount were measured within a frequency range of 2.0-18.0 GHz, respectively. Reflection loss maxima of -25.5 dB at 8.0 GHz were achieved for 50 wt. Fe 2Ni 2N composite of 3 mm thickness, suggesting that as-prepared Fe 2Ni 2N could be a promising candidate as microwave absorbing filler, which is to help to practicably broaden the scope of microwave absorbing materials. © 2012 American Institute of Physics.