Microwave Absorption of <I>γ</I>′-Fe<SUB>2.6</SUB>Ni<SUB>1.4</SUB>N Nanoparticles Derived from Nitriding Counterpart Precursor

Abstract

Gamma-Fe2.6Ni1.4 nanoparticles were prepared by the arc-discharge method as the precursor and its nitride counterpart of gamma'-Fe2.6Ni14N nanoparticles was synthesized directly through a thermal ammonolysis reaction at the temperature of 673 K for two hours. The resultant product was identified as a homogeneous ternary nitride with nearly spherical shape and average size of about 60.0 nm. The electromagnetic characteristics of gamma'-Fe2.6Ni1.4N derivant and gamma-Fe2.6Ni1.4 precursor have been studied in the frequency range of 2-18 GHz. Compared with the precursor, gamma'-Fe2.6Ni1.4N nanoparticles exhibits an enhanced electromagnetic absorption property resulted from the increased dielectric loss by nitriding process. The optimal reflection loss (RL) of gamma'-Fe2.6Ni1.4N nanoparticles/paraffin composite can reach -39.9 dB at 5.2 GHz in a thickness of 2.29 mm, and the frequency band corresponding RL < -10 dB is over 2.6-18 GHz in the thickness range of 0.78-4.20 mm.

Microwave absorption and flexural properties of Fe nanoparticle/carbon fiber/epoxy resin composite plates

“…It can be observed in "vertical" cases that all RL values fall in range of C band (4-8GHz) and K u band(12)(13)(14)(15)(16)(17)(18).…”