Structure and magnetic properties of Fe(C) and Co(C) nanocapsules prepared by chemical vapor condensation

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	Structure and magnetic properties of Fe(C) and Co(C) nanocapsules prepared by chemical vapor condensation
	Z. H. Wang; Z. D. Zhang; C. J. Choi; B. K. Kim
	2003
发表期刊	Journal of Alloys and Compounds
ISSN	0925-8388
卷号	361 期号:1-2 页码:289-293
摘要	Carbon-coated Fe and Co nanocapsules have been synthesized by a chemical vapor condensation process using carbon monoxide as carrier gas. The characterization and magnetic properties of carbon-coated Fe and Co nanocapsules are investigated and compared. The core/shell structure of the Fe(C) nanocapsules is similar to that of the Co(C) nanocapsules, consisting of an amorphous shell and a metallic core. The phases of the Co(C) nanocapsules are composed of f.c.c.-Co, h.c.p.-Co and cobalt carbides regardless of the decomposition temperature and the CO gas flow rate. The phases of the Fe(C) nanocapsules change with changing decomposition temperature and CO gas flow rate. The majority phases of the Fe(C) nanocapsules are alpha-Fe and Fe3C when the decomposition temperature is between 500 and 1000 degreesC, but for 700 degreesC only Fe3C exists alpha-Fe, gamma-Fe and Fe3C phases coexist after preparation at 1100 degreesC. The saturation magnetization of the Co(C) nanocapsules increases with increasing decomposition temperature, while that of the Fe(C) nanocapsules is less dependent on the phases formed. The cobalt nanocapsules reach 90% of the value of the saturation magnetization of bulk cobalt, while the iron nanocapsules obtained at 400 and 1100 degreesC reach 75 and 33 % of the saturation magnetization of bulk iron. The carbon-coated Fe and Co nanocapsules are shown to be ferromagnetic with a ratio of the remnant magnetization to saturation magnetization M-r/M-s of 0.3-0.4. (C) 2003 Elsevier B.V. All rights reserved.
部门归属	acad sinica, met res inst, shenyang natl lab mat sci, shenyang 110016, peoples r china. acad sinica, met res inst, int ctr mat phys, shenyang 110016, peoples r china. korea inst machinery & mat, kyungnam 641010, south korea.;wang, zh (reprint author), acad sinica, met res inst, shenyang natl lab mat sci, wenhua rd 72, shenyang 110016, peoples r china
关键词	Nanostructured Materials Vapour Deposition Crystal Structure Magnetic Measurements Transmission Electron Microscopy (Tem) Coated Fe-co(c) Nanocapsules Arc-discharge Nanoparticles Fe Co Methane
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WOS记录号	WOS:000186125800048
引用统计	被引频次：84[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/321006/36073
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	Z. H. Wang,Z. D. Zhang,C. J. Choi,et al. Structure and magnetic properties of Fe(C) and Co(C) nanocapsules prepared by chemical vapor condensation[J]. Journal of Alloys and Compounds,2003,361(1-2):289-293.
APA	Z. H. Wang,Z. D. Zhang,C. J. Choi,&B. K. Kim.(2003).Structure and magnetic properties of Fe(C) and Co(C) nanocapsules prepared by chemical vapor condensation.Journal of Alloys and Compounds,361(1-2),289-293.
MLA	Z. H. Wang,et al."Structure and magnetic properties of Fe(C) and Co(C) nanocapsules prepared by chemical vapor condensation".Journal of Alloys and Compounds 361.1-2(2003):289-293.