Structure and magnetic properties of Gd nanoparticles and carbon coated Gd/GdC2 nanocapsules

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	Structure and magnetic properties of Gd nanoparticles and carbon coated Gd/GdC2 nanocapsules
	P. Z. Si; I. Skorvanek; J. Kovac; D. Y. Geng; X. G. Zhao; Z. D. Zhang
	2003
发表期刊	Journal of Applied Physics
ISSN	0021-8979
卷号	94 期号:10 页码:6779-6784
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.
部门归属	chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. chinese acad sci, int ctr mat phys, shenyang 110016, peoples r china. slovak acad sci, inst expt phys, kosice 04353, slovakia.;si, pz (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china
关键词	Rare-earth-metals Gamma-fe2o3 Nanoparticles Fe-co(c) Nanocapsules Gadolinium Particles Transition Carbides Behavior Oxides
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WOS记录号	WOS:000186276600084
引用统计	被引频次：30[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/36020
专题	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.