Oxidation behavior and magnetic properties of metallic ultrafine particles

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	Oxidation behavior and magnetic properties of metallic ultrafine particles
	X. Q. Zhao; B. X. Liu; Y. Liang; Z. Q. Hu
	1996
发表期刊	Journal of Magnetism and Magnetic Materials
ISSN	0304-8853
卷号	164 期号:3 页码:401-410
摘要	Iron (including bcc and fee structures), iron nitride, iron carbide, and iron carbonitride ultrafine particles (< 100 nm in size) have been prepared by laser-induced pyrolysis of iron carbonyl, ammonia and ethylene mixtures. Transmission electron microscopy, X-ray diffraction, oxygen, nitrogen and carbon determiners, and a vibrating sample magnetometer were employed to characterize the metallic particles and measure their magnetic properties. It is found that the presence of carbon in the metallic particles not only significantly affects the oxygen content, but also affects the state of the oxygen at the particle surface, and thereby affects the magnetic properties of the ultrafine particles. In addition, taking advantage of the paramagnetism of face-centered-cubic structured iron (gamma-Fe) ultrafine particles, the morphologies and magnetic properties of the iron oxide layers formed on the particle surfaces were determined. Convincing evidence was obtained indicating that the iron oxide layers formed on the metallic particles are composed of very fine crystallites and provide no contribution to the saturation magnetization of the particles. The structure of the iron oxide layers on the iron particle surfaces is also discussed and we conclude that the oxide layer formed at room temperature is a single Fe3O4 layer, rather than a mixture of Fe3O4 and gamma-Fe2O3.
部门归属	acad sinica,inst met res,natl lab rsa,shenyang 110015,peoples r china.;zhao, xq (reprint author), tsing hua univ,dept mat sci & engn,beijing 100084,peoples r china
关键词	Ultrafine Particles Surface Oxide Layer Magnetic Properties Iron Iron Nitride And Carbide Iron-nitride Particles Oxide Mossbauer Surface Powder Layer Coercivity Dependence Tapes Size
URL	查看原文
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/38496
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	X. Q. Zhao,B. X. Liu,Y. Liang,et al. Oxidation behavior and magnetic properties of metallic ultrafine particles[J]. Journal of Magnetism and Magnetic Materials,1996,164(3):401-410.
APA	X. Q. Zhao,B. X. Liu,Y. Liang,&Z. Q. Hu.(1996).Oxidation behavior and magnetic properties of metallic ultrafine particles.Journal of Magnetism and Magnetic Materials,164(3),401-410.
MLA	X. Q. Zhao,et al."Oxidation behavior and magnetic properties of metallic ultrafine particles".Journal of Magnetism and Magnetic Materials 164.3(1996):401-410.