Complex permeability and microwave absorption properties of planar anisotropy Ce_2Fe_(17)N_(3-?) particles

摘要

The effective complex permeability of Ce_2Fe_(17)N_(3-?) particles/epoxy resin composites with various volume concentrations p were measured in the frequency range of 0.1-15 GHz. The intrinsic quasi-static permeability ì'_(0,i) of Ce_2Fe_(17)N_(3-?) particle was calculated by Bruggerman's (BG) effective medium theory. Meanwhile,' the effective quasi-static permeability ì'_(0,e) of composites were calculated by the BG theory and modified Bruggerman's (MBG) effective medium theory, respectively. Through analyzing the experiment data, the effective shape factors of Ce_2Fe_(17)N_(3-?) composites were determined. The intrinsic natural resonance frequency of Ce_2Fe_(17)N_(3-?) was obtained using Landua-Lifshitz-Gilbert (LLG) equation. The minimum EM absorbing values with RL≤-30 dB are observed for all the volume concentrations.