New Utilization of Nitrogen using Metal Nitrides
利用金属氮化物进行氮的新利用
基本信息
- 批准号:12450352
- 负责人:
- 金额:$ 8万
- 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 2002
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
In this study, the nitrogen absorption and desorption properties of the iron based intermetallic compounds were investigated. Furthermore, the fabrication of functional material by the change of structure and electronic state was performed on Fe_3N/Y_2O_3 nanocomposite for the microwave absorption. The summary is as followed.Nitrogen absorption and desorption characteristics on rare earth-iron intermetallic compounds, R_2Fe_<17> and RFe_7, were performed. The nitrogen absorption and desorption properties of RFe_7 was superior to that of R_2Fe_<17> because of the ease of nitrogen diffusion due to the difference of crystal structure between them.Y_2Fe_<17> transforms from crystalline to amorphous state by absorption of nitrogen into its crystal lattice. The calculation by the DV-Xα cluster method revealed that the insertion of nitrogen into the crystal lattice unstabilizes the Y-Fe and Fe-Fe bond strength around the nitrogen atom in octahedral Y_2Fe_4 or tetrahedral Y_2Fe_2 unit.The fine composite powders of Fe-Mox (M=Ce, Al, Si, Sr, and Zr) were prepared. High catalytic activity of ammonia decomposition was observed on Fe-(Ce, Zr)O_2. This result is ascribable to the enhancement of surface area and solid acidity of(Ce, Zr)O_2 to adsorb ammonia and increase the reaction probability.The electromagnetic wave absorption properties of Fe_3N/Y_2O_3 nanocomposites were characterized. The resin composites with 80 wt% Fe_3N/Y_2O_3 powders exhibited excellent electromagnetic wave absorption properties (RL<-20 dB) in a frequency range of 0.6-4.4 GHz, with thickness of 3.3-19.3 mm.
本文研究了铁基金属间化合物的吸氮和脱氮性能。在此基础上,通过改变Fe_3N/Y_2O_3纳米复合材料的结构和电子态,制备了具有微波吸收功能的功能材料。研究了稀土-铁金属间化合物R_2Fe_3和RFe_7的吸氮和脱氮特性<17>。由于RFe_7和R_2Fe_3晶体结构的差异,使得氮易于扩散,RFe_7的吸氮和脱氮性能上级R_2Fe_3<17>,而Y_2Fe_3<17>则是通过将氮吸附到晶格中而从晶态转变为非晶态。用DV-Xα团簇方法计算表明,氮的插入使八面体Y_2Fe_4或四面体Y_2Fe_2单元中氮原子周围的Y-Fe和Fe-Fe键强度不稳定。结果表明,Fe-(Ce,Zr)O_2具有较高的氨分解催化活性。这是由于(Ce,Zr)O_2的比表面积和固体酸性增大,有利于吸附NH_3,提高了反应几率。当Fe 3 N/Y2 O3粉末含量为80wt%时,复合材料在0.6- 4.4GHz频率范围内具有良好的电磁波吸收性能(RL<-20dB),厚度为3.3- 19.3mm。
项目成果
期刊论文数量(30)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Masahiro Itoh: "Ammonia Production Characteristics of Ru/Al_2O_3 Catalysts using Hydrogen Permeable Membrane"Chemistry Letters. 1162-1163 (2000)
Masahiro Itoh:“利用氢渗透膜的Ru/Al_2O_3催化剂的氨生产特性”化学快报。
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- 影响因子:0
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MACHIDA Ken-ichi其他文献
MACHIDA Ken-ichi的其他文献
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{{ truncateString('MACHIDA Ken-ichi', 18)}}的其他基金
Development of Nano-functional Materials Derived from Metal and/or'Ceramics Glasses as Precursors
以金属和/或陶瓷玻璃为前体衍生的纳米功能材料的开发
- 批准号:
15205025 - 财政年份:2003
- 资助金额:
$ 8万 - 项目类别:
Grant-in-Aid for Scientific Research (A)
Rare Earth Resources and Their Effective Utilization
稀土资源及其有效利用
- 批准号:
14404014 - 财政年份:2002
- 资助金额:
$ 8万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Development of High-performance Magnetic Coupling Composite-type Rare Earth Magnets
高性能磁耦合复合型稀土磁体的研制
- 批准号:
12555178 - 财政年份:2000
- 资助金额:
$ 8万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
DEVELOPMENT OF HIGH-PERFORMANCE RARE EARTH BONDED MAGNETS
高性能稀土粘结磁体的开发
- 批准号:
10555218 - 财政年份:1998
- 资助金额:
$ 8万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Synthesis and Application of High-coercive Magnetic Powders in Rare Earth Intermetallic Compound Systems
稀土金属间化合物体系高矫顽磁粉的合成及应用
- 批准号:
07555271 - 财政年份:1995
- 资助金额:
$ 8万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
A Study on Synthesis of Silicates by High-Pressure Hydrothermal Method using Organic Template Reagents
有机模板剂高压水热法合成硅酸盐的研究
- 批准号:
02650551 - 财政年份:1990
- 资助金额:
$ 8万 - 项目类别:
Grant-in-Aid for General Scientific Research (C)
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Development of a High Intensity Source of Atomic Nitrogen for Semiconductor Doping and Plasma and Atmospheric Physics Applications; to support visit by J.M. Woolsey, University of Sterling, U.K.
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