Microwave Absorption in the GHz Range of Nanostructure Produced by Disproportionation Reaction of Rare Earth-Iron Compound
稀土铁化合物歧化反应产生的纳米结构在 GHz 范围内的微波吸收
基本信息
- 批准号:12450276
- 负责人:
- 金额:$ 4.67万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Scientific Research (B)
- 财政年份:2000
- 资助国家:日本
- 起止时间:2000 至 2001
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
For the 1-5 GHz frequency range, both Spinel-type ferrites and metallic magnetic materials can be used as electromagnetic wave absorbers. However, because the latter materials have larger values of saturation magnetization, their Snoek's limit are at a higher frequency and so their values of relative complex permeability remain high in this frequency range. Therefore, it is possible to make thinner absorbers from metallic magnetic materials.The magnetization of electrically conductive magnetic materials, induced by electromagnetic waves, decreases due to eddy current losses. For this reason, it is best to use smaller particles, compared to the skindepth, when making electromagnetic wave absorbers from such materials. In this study, the possibility of using the disproportionation reaction of the Sm_2Fe_<17> compound for the production of powders with a fine α-Fe structure was investigated, for use as electromagnetic wave absorbers that can operate in the GHz frequency range. A fine α-Fe … More / SmH_2 or α-Fe / SmO structure with a sub-micrometer size is formed from the Sm_2Fe_<17> compound after disproportionation in hydrogen or air, respectively. In this way, magnetic powders with a fine structure of α-Fe were obtained. The powders disproportionated in hydrogen, were heated in air in order to oxidize the Sm hydride, to give a α-Fe / SmO two-phase microstructure, and thereby increase the resistivity of the powders. Toroidally shaped epoxy-resin composites were made from this powder, and the microwave absorption properties of these samples were measured. An undisproportionated sample did not show any electromagnetic wave absorption in this frequency range. However, the disproportionated samples (heated in hydrogen at 873 K for 1 hour, milled for 30 minutes and oxidized at 473 K for 2 hours in air) exhibited electromagnetic wave absorption (R.L.< -20dB) in the frequency (f_m) range 0.73 to 1.30 GHz, for absorber thicknesses (dm) ranging from 13.1 to 7.9 mm, respectively. The disproportionated samples in air (heated at 473K for 2 hours and milled for 30 minutes) also showed good electromagnetic wave absorption properties (f_m=-1.21 - 2.50 GHz and d_m= 8.0 - 4.2 GHz). It is concluded that the disproportionation reaction, in either hydrogen or in air, is a useful method for the production of powders with a fine α-Fe structure, which can be used for microwave absorbers that operate in the several GHz range. Less
对于1- 5GHz频率范围,尖晶石型铁氧体和金属磁性材料都可以用作电磁波吸收剂。然而,因为后者材料具有较大的饱和磁化强度值,它们的Snoek极限处于较高的频率,因此它们的相对复磁导率值在该频率范围内保持较高。因此,可以用金属磁性材料制造更薄的吸收体。导电磁性材料的磁化强度,由电磁波感应,由于涡流损耗而降低。出于这个原因,最好是使用较小的颗粒,相比skindepth,当从这样的材料制造电磁波吸收剂。本文研究了利用Sm_2Fe_3化合物的还原反应<17>制备具有精细α-Fe结构的粉末的可能性,以用作GHz频段的电磁波吸收剂。细α-Fe ...更多信息 Sm_2Fe_2化合物在氢气或空气中分解后分别形成亚微米级的α-Fe/ SmH_2或α-Fe / SmO结构<17>。通过这种方法,获得了具有精细α-Fe结构的磁粉。在氢气气氛中焙烧的粉末,在空气中加热氧化Sm的氢化物,得到α-Fe / SmO两相结构,从而提高粉末的电阻率。用该粉末制备了环形环氧树脂复合材料,并测量了这些样品的微波吸收性能。未纯化的样品在该频率范围内未显示出任何电磁波吸收。然而,纯化的样品(在氢气中在873 K下加热1小时,研磨30分钟,并在空气中在473 K下氧化2小时)表现出电磁波吸收(R.L.在频率(f_m)为0.73 ~ 1.30GHz范围内,吸收体厚度(dm)为13.1 ~ 7.9mm时,吸收体的吸收强度分别小于-20dB。在空气中(473 K加热2 h,球磨30 min)处理的样品也表现出良好的电磁波吸收性能(f_m=-1.21 ~2.50GHz,d_m= 8.0 ~ 4.2GHz)。结果表明,无论是在氢气中还是在空气中,均能有效地制备出具有良好α-Fe结构的粉末,这种粉末可用于工作在几GHz范围内的微波吸收剂。少
项目成果
期刊论文数量(14)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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SUGIMOTO Satoshi其他文献
SUGIMOTO Satoshi的其他文献
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{{ truncateString('SUGIMOTO Satoshi', 18)}}的其他基金
Development of multi-point measurement method by wireless sensor network system for risk evaluation of slope failure
无线传感器网络系统多点测量方法开发边坡失稳风险评价
- 批准号:
17K13005 - 财政年份:2017
- 资助金额:
$ 4.67万 - 项目类别:
Grant-in-Aid for Young Scientists (B)
Preparation of Nanocomposite Magnets with High Coercivity and Heat Resistance
高矫顽力和耐热性纳米复合磁体的制备
- 批准号:
23656420 - 财政年份:2011
- 资助金额:
$ 4.67万 - 项目类别:
Grant-in-Aid for Challenging Exploratory Research
Microwave Absorption Properties of Magnetic Nanoparticles Prepared Using Cross Linking Reaction
交联反应制备的磁性纳米粒子的微波吸收性能
- 批准号:
23360298 - 财政年份:2011
- 资助金额:
$ 4.67万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Development of a high energy efficient process in a plasma-catalyst reaction field for a hydrogen production without carbon dioxide emission
在等离子体催化剂反应场中开发一种高能效工艺,用于不排放二氧化碳的制氢
- 批准号:
22612002 - 财政年份:2010
- 资助金额:
$ 4.67万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
Fabrication of Rare Earth-Fe Compound with a Panoscopic Structure and Their Microwave Absorption Properties in the GHz range
具有全景结构的稀土铁化合物的制备及其在 GHz 范围内的微波吸收性能
- 批准号:
20900105 - 财政年份:2008
- 资助金额:
$ 4.67万 - 项目类别:
Fabrication of High Performance Thick Film Magnets by Aerosol Deposition Method
气溶胶沉积法制备高性能厚膜磁体
- 批准号:
15360378 - 财政年份:2003
- 资助金额:
$ 4.67万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Development of Microwave Absorber Composed of Dual Ferrite Phase
双铁氧体相微波吸收体的研制
- 批准号:
13555183 - 财政年份:2001
- 资助金额:
$ 4.67万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Magnetic Properties of Nanostructured Rare Earth-Fe Compound Produced by HDDR Process
HDDR 工艺生产的纳米结构稀土铁化合物的磁性能
- 批准号:
10555240 - 财政年份:1998
- 资助金额:
$ 4.67万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Production of Rare Earth-Fe Bonded Magnet Powders with High Remanence Utilizing Gas Reaction
利用气体反应生产高剩磁稀土铁粘结磁粉
- 批准号:
10450252 - 财政年份:1998
- 资助金额:
$ 4.67万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Development of Spring-type Magnet in Nitrogen Contained Rare-earth-Fe Compounds
含氮稀土铁化合物弹簧型磁体的研制
- 批准号:
06650768 - 财政年份:1994
- 资助金额:
$ 4.67万 - 项目类别:
Grant-in-Aid for General Scientific Research (C)