Structure and magnetic properties of Gd nanoparticles and carbon coated Gd/GdC2 nanocapsules
文献类型：期刊论文
| 作者 | P. Z. Si ; I. Skorvanek ; J. Kovac ; D. Y. Geng ; X. G. Zhao ; Z. D. Zhang |
| 刊名 | Journal of Applied Physics
 |
| 出版日期 | 2003 |
| 卷号 | 94期号:10页码:6779-6784 |
| 关键词 | rare-earth-metals gamma-fe2o3 nanoparticles fe-co(c) nanocapsules gadolinium particles transition carbides behavior oxides |
| ISSN号 | 0021-8979 |
| 中文摘要 | Gd nanoparticles and carbon coated Gd/GdC2 nanocapsules have been prepared by means of arc discharge in argon and methane, respectively. In the Gd nanoparticles, gadolinium oxide was detected by x-ray diffraction, while the presence of metallic gadolinium was proved by oxygen analysis and x-ray photoelectron spectra. In the nanocapsules, the existence of GdC2 and Gd was detected by x-ray diffraction. Shell/core structures were observed for either the nanoparticles (with diameters larger than 20 nm) or the nanocapsules. The magnetization data above 25 K, when scaled as a function of mu(0)H/T, fall on a universal curve while the deviation of the magnetization curves at 4.2 K from the universal curves was ascribed to the superparamagnetism-ferromagnetism transition of small Gd particles. The temperature dependence of magnetization supports the theoretical predictions for very tiny Gd nanoparticles. The presence of metallic Gd in these nanocapsules results in comparatively high magnetization of about 60.5 A m2/kg at 4.2 K, compared with the carbon-coated gadolinium carbide nanocapsules without the metallic Gd core. The possibility of the existence of the spin-glass-like state is discussed for Gd(O) nanoparticles and Gd(C) nanocapsules. (C) 2003 American Institute of Physics. |
| 原文出处 | |
| 公开日期 | 2012-04-14 |
| 源URL | [http://ir.imr.ac.cn/handle/321006/36020]  |
| 专题 | 金属研究所_中国科学院金属研究所 |
| 推荐引用方式 GB/T 7714 | P. Z. Si,I. Skorvanek,J. Kovac,et al. Structure and magnetic properties of Gd nanoparticles and carbon coated Gd/GdC2 nanocapsules[J]. Journal of Applied Physics,2003,94(10):6779-6784. |
| APA | P. Z. Si,I. Skorvanek,J. Kovac,D. Y. Geng,X. G. Zhao,&Z. D. Zhang.(2003).Structure and magnetic properties of Gd nanoparticles and carbon coated Gd/GdC2 nanocapsules.Journal of Applied Physics,94(10),6779-6784. |
| MLA | P. Z. Si,et al."Structure and magnetic properties of Gd nanoparticles and carbon coated Gd/GdC2 nanocapsules".Journal of Applied Physics 94.10(2003):6779-6784. |
入库方式： OAI收割
来源：金属研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。