标题：Electromagnetic and absorption properties of nano-sized and micro-sized Fe4N particles
作者：Yu, Meijie; Xu, Yong; Mao, Qiong; Li, Fazhan; Wang, Chengguo
作者机构：[Yu, Meijie; Mao, Qiong; Li, Fazhan; Wang, Chengguo] Shandong Univ, Coll Mat Sci & Engn, Jinan 250061, Peoples R China.; [Xu, Yong] Shandong Jianzhu 更多
通讯作者地址：[Yu, MJ]Shandong Univ, Coll Mat Sci & Engn, Jinan 250061, Peoples R China.
来源：JOURNAL OF ALLOYS AND COMPOUNDS
关键词：Iron nitride; Nanoparticle; Electromagnetic property; X-ray diffraction
摘要：Single-phase Fe4N has been synthesized by gaseous nitriding micro-sized and nano-sized Fe particles at 793 K under ammonia atmosphere. The electromagnetic properties of their wax composite with 75 wt% magnetic particles have been investigated within the frequency range of 1-18 GHz. Both size and phase effects on the microwave absorption properties were discussed on the results of scanning electronic microscopy, X-ray diffraction, hysteresis loop, and the frequency dependence of complex permittivity and permeability. The results show that nano-sized particles have superior absorbing performance at lower frequency band than the corresponding micro-sized ones, which is mainly attributed to the higher dielectric constant caused by interfacial polarization. The Fe4N composites exhibit much stronger absorption in 2-8 GHz than Fe composites. The reflection loss (RL) values of less than -10 dB are observed in a wide frequency bandwidth from 1.8 to 11 GHz for nano-sized Fe4N composite with absorber thickness of 1.2-5.0 mm. Its minimum RL value (RLmin = -33 dB) appears at 3.5 GHz with a thickness of 3.0 mm. This study demonstrates the possible application of producing thin and light absorbers from nano-sized Fe4N particles for microwave absorption at S and C bands (2-8 GHz). (C) 2015 Elsevier B.V. All rights reserved.