Microwave electromagnetic and absorption properties of SmN/伪-Fe/Sm<sub>2sub>Fe<sub>17sub>N<sub>3sub> composites in 0.5-18 GHz range
- 作者：Jinwen Ye ; Ying Liu<sup> ; sup><sup>liuying5536@163.comsup> ; Xianfu Chen ; Mingying Yao
- 关键词：Electromagnetic wave absorber ; SmN/伪-Fe/Sm2Fe17N3 composites ; Complex permittivity and permeability
- 刊名：Journal of Alloys and Compounds
- 出版年：2012
- 期刊代码：45_09258388
- 类别：ms
- 出版时间：15 June, 2012
- 卷：526
- 期：Complete
- 页码：59-62
- 文件大小：758 K
摘要
SmN/伪-Fe/Sm<sub>2sub>Fe<sub>17sub>N<sub>3sub> composites were prepared in situ by heating of Sm<sub>2sub>Fe<sub>17sub>N<sub>3sub> powders, and their electromagnetic wave absorption properties were measured in the frequency range of 0.5-18 GHz. The result shows that saturation magnetization and coercivity of as-heated powder with 23.7 wt%SmN, 58.5 wt%伪-Fe and 17.8 wt%Sm<sub>2sub>Fe<sub>17sub>N<sub>3sub> are 130.82 emu/g and 750 Oe, respectively. The dielectric constant of composites was low over the frequency range of 0.5-18 GHz, and their resonance frequencies were at a high frequency range. The effective electromagnetic wave absorption (RL < 鈭?0 dB) of the compact sample with thickness of 0.7-3.2 mm prepared with the SmN/伪-Fe/Sm<sub>2sub>Fe<sub>17sub>N<sub>3sub> and resin was obtained in a frequency range of 5.5-16 GHz. A minimum reflection loss of 鈭?3 dB of the samples was observed at 5.5 GHz with an absorber thickness of 3.2 mm.