Tuning effect of silicon substitution on magnetic and high frequency electromagnetic properties of R2Fe17 and their composites
来源期刊：JOURNAL OF RARE EARTHS2019年第10期
论文作者：Wenyun Yang Qiwei Hu Guanyi Qiao Liang Zha Shunquan Liu Jingzhi Han Honglin Du Yan Zhang Yingchang Yang Changsheng Wang
文章页码：1102 - 1107
摘 要：In this work, we report the tuning effect of the Si substitution on the magnetic and high frequency electromagnetic properties of R2 Fe17 compounds and their paraffin composites. It is found that the introduction of Si can remarkably improve the magnetic and electromagnetic properties of the R2 Fe17 compounds, making the R2 Fe17 exSix-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%e50%, which finally enhances the performance 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 e15.3 GHz） is obtained for the Sm1.5 Y0.5 Fe15 Si2-paraffin composite（d = 1.0 mm） and the maximum RL of -53.6 dB is achieved for Nd2 Fe15 Si2-paraffin composite（d = 2.2 mm）, both surpassing most of the reported MAMs. Additionally, a distinguished dielectric microwave absorption peak is observed, which further increases the QB in these composites.
Wenyun Yang1,2，Qiwei Hu1,2，Guanyi Qiao1,2，Liang Zha1,2，Shunquan Liu1,2，Jingzhi Han1,2，Honglin Du1,2，Yan Zhang1，Yingchang Yang1，Changsheng Wang1,2
1. State Key Laboratory for Mesoscopic Physics, School of Physics, Peking University2. Beijing Key Laboratory for Magnetoeletric Materials and Devices
摘 要：In this work, we report the tuning effect of the Si substitution on the magnetic and high frequency electromagnetic properties of R2 Fe17 compounds and their paraffin composites. It is found that the introduction of Si can remarkably improve the magnetic and electromagnetic properties of the R2 Fe17 compounds, making the R2 Fe17 exSix-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%e50%, which finally enhances the performance 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 e15.3 GHz） is obtained for the Sm1.5 Y0.5 Fe15 Si2-paraffin composite（d = 1.0 mm） and the maximum RL of -53.6 dB is achieved for Nd2 Fe15 Si2-paraffin composite（d = 2.2 mm）, both surpassing most of the reported MAMs. Additionally, a distinguished dielectric microwave absorption peak is observed, which further increases the QB in these composites.
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