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：
MACHIDA Ken-ichi
金额：
$ 8万
依托单位：
Osaka University
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

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.

在这项研究中，研究了铁基质间化合物的氮惊喜和解吸特性。此外，在FE_3N/Y_2O_3纳米复合材料上，对Microwave惊喜进行了通过结构和电子状态的变化来制造功能材料。摘要如下。对稀有地球的金属间化合物，R_2FE_ <17>和RFE_7进行了硝基激素惊喜和解吸特性。 RFE_7的氮惊喜和解吸特性优于R_2FE_ <17>，因为由于它们之间的晶体结构的差异而引起的氮差异易于。 DV-Xα簇方法的计算表明，将氮插入晶体晶格中的插入使Y_2FE_4或四面体Y_2FE_2FE_2FE_2的氮原子周围的Y-FE和Fe-FE键强度插入了Y-FE和Fe-FE键强度。在Fe-（CE，ZR）O_2上观察到氨分解的高催化活性。该结果可归因于表面积的增强和（Ce，Zr）O_2对吸附氨的固体酸度并增加了反应概率。表征了Fe_3n/Y_2O_3纳米复合材料的电磁波吸收特性。具有80 wt％Fe_3n/Y_2O_3的树脂成分暴露于出色的电磁波吸收特性（RL <-20 dB），频率范围为0.6-4.4 GHz，厚度为3.3-19.3 mm。