首页|Tuning effect of silicon substitution on magnetic and high frequency electromagnetic properties of R2Fe17 and their composites

Tuning effect of silicon substitution on magnetic and high frequency electromagnetic properties of R2Fe17 and their composites

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In this work, we report the tuning effect of the Si substitution on the magnetic and high frequency electromagnetic properties of R2Fe17 compounds and their paraffin composites. It is found that the introduction of Si can remarkably improve the magnetic and electromagnetic properties of the R2Fe17 compounds, making the R2Fe17-xSix-paraffin composites excellent microwave absorption materials (MAMs). By introducing the Si element, their saturation magnetizations decrease slightly, while much higher Curie temperatures are obtained. Furthermore, better impedance match is reached due to the decrease of the high-frequency permittivity ε' by about 40％-50％, which finally enhances the perfor-mance of the microwave absorption. The peak frequency (fRL) of the reflection loss (RL) curve moves toward high frequency domain and the qualified bandwidth (QB, RL ≤ -10 dB) increases remarkably. The maximum QB of 3.3 GHz (12.0-15.3 GHz) is obtained for the Sm1.5Y0.5Fe15Si2-paraffin composite (d = 1.0 mm) and the maximum RL of -53.6 dB is achieved for Nd2Fe15Si2-paraffin composite (d = 2.2 mm), both surpassing most of the reported MAMs. Additionally, a distinguished dielectric mi-crowave absorption peak is observed, which further increases the QB in these composites.

Rare-earth transition-metal intermetallicsSi substitutionMagnetismCompositesMicrowave absorption properties

Wenyun Yang、Qiwei Hu、Guanyi Qiao、Liang Zha、Shunquan Liu、Jingzhi Han、Honglin Du、Yan Zhang、Yingchang Yang、Changsheng Wang

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State Key Laboratory for Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, China

Beijing Key Laboratory for Magnetoeletric Materials and Devices, Beijing 100871, China

Project supported by the National Key Research and Development Program of ChinaProject supported by the National Key Research and Development Program of Chinaand National Natural Science Foundation of Chinaand National Natural Science Foundation of Chinaand National Natural Science Foundation of China

2016YFB07009012017YFA0403701517310011167500611805006

2019

稀土学报(英文版)
中国稀土学会

稀土学报(英文版)

CSTPCDCSCDSCIEI
影响因子：1.3
ISSN：1002-0721
年,卷(期)：2019.37(10)
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