高平,柯亚娇,徐逸凡,闫金铃,王嘉赋.二维Fe5GeTe2单晶的大量制备及吸波性能研究[J].包装工程,2023,44(23):275-282.
GAO Ping,KE Ya-jiao,XU Yi-fan,YAN Jin-ling,WANG Jia-fu.Mass Preparation and Microwave Absorption Performance of Two-dimensional Fe5GeTe2 Single Crystals[J].Packaging Engineering,2023,44(23):275-282. |
| 二维Fe5GeTe2单晶的大量制备及吸波性能研究 |
| Mass Preparation and Microwave Absorption Performance of Two-dimensional Fe5GeTe2 Single Crystals |
| 投稿时间：2023-07-12 |
| DOI：10.19554/j.cnki.1001-3563.2023.23.033 |
| 中文关键词: 微波吸收 损耗机制 阻抗匹配 二维材料 室温磁性 |
| 英文关键词: microwave absorption loss mechanism impedance matching two-dimensional materials room-temperature ferromagnetism |
| 基金项目:国家自然科学基金(11704294);国家重点研发计划(2018YFE0111500) |
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| 中文摘要: |
| 目的 快速制备克量级、高质量的二维磁性Fe5GeTe2单晶，并开发具有范德华结构、室温铁磁性及优异微波吸收性能的新型吸波材料。方法 通过调控输运剂的含量，并缩短化学气相传输法的恒温段时长，以探索高质量Fe5GeTe2单晶的快速、制备量大的方法。将Fe5GeTe2单晶与石蜡按不同质量分数混合后，通过同轴线测试法分析其微波性能。结果 成功制备了克量级、高质量的Fe5GeTe2单晶样品。借助矢量分析仪的同轴线测试法研究Fe5GeTe2单晶的微波损耗性能发现，当Fe5GeTe2的质量分数为30%时，Fe5GeTe2的吸波特性较差，最佳反射损耗值仅为−4.8 dB;当Fe5GeTe2的质量分数达到70%时，Fe5GeTe2载荷的增加导致界面极化增强，并改善了阻抗匹配。电磁波顺利进入吸波剂内部，并以介电损耗和磁损耗的形式耗散掉，吸波性能得到极大提升，最佳反射损耗值达到了−35.5 dB。结论 成功制备了克量级、高质量Fe5GeTe2单晶样品，为该二维磁性材料的基础物性研究提供了一个良好的物质基础，其优异的微波吸收特性归因于良好的阻抗匹配和多种损耗机制的协同作用。具有室温磁性的Fe5GeTe2是一种具有优异性能的新型吸波材料，也为复合吸波剂的研究提供了多种选择。 |
| 英文摘要: |
| The work aims to rapidly prepare gram-scale, high-quality two-dimensional magnetic Fe5GeTe2 single crystals and develop new absorbing materials with van der Waals structure, room-temperature ferromagnetism, and excellent microwave absorption performance. In this work, Fe5GeTe2 single crystal samples were synthesized by adjusting the content of transport agents and shortening the constant temperature period of chemical vapor transport method. Fe5GeTe2 single crystals were mixed with paraffin wax according to different mass fractions. Their microwave absorption performance was analyzed by a coaxial line test. Gram-scale, high-quality Fe5GeTe2 single crystal samples were prepared successfully. The microwave absorption performance of Fe5GeTe2 single crystals was analyzed by the coaxial wire method with a vector network analyzer. The results indicated that the absorption performance of 30% Fe5GeTe2 was poor, and the minimum reflection loss value was only −4.8 dB. However, as the mass fraction of Fe5GeTe2 increased to 70%, the enhanced Fe5GeTe2 load in the Fe5GeTe2/paraffin composites led to improved interface polarization and enhanced impedance matching. The electromagnetic wave could smoothly penetrate the Fe5GeTe2/paraffin composites and then be dissipated via dielectric loss and magnetic loss, significantly enhancing its absorption performance. The minimum reflection loss value could reach −35.5 dB. The successful synthesis of gram-scale high-quality Fe5GeTe2 single crystals establishes a solid material foundation for researching the fundamental physical properties of this two-dimensional ferromagnet. Additionally, Fe5GeTe2 with room-temperature magnetic properties is not only a new type of absorbing material with excellent performance, but also provides a new choice for the research of composite absorbing agents. |
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