Composition and magnetic properties of cobalt ferrite nano-particles prepared by the co-precipitation method

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	Composition and magnetic properties of cobalt ferrite nano-particles prepared by the co-precipitation method
	Y. Zhang ; Z. Yang ; D. Yin ; Y. Liu ; C. L. Fei ; R. Xiong ; J. Shi ; G. L. Yan
刊名	Journal of Magnetism and Magnetic Materials
	2010
卷号	322 期号:21 页码:3470-3475
关键词	Cobalt ferrite nano-particles Co-precipitation Composition Magnetic properties cofe2o4 nanoparticles hydrothermal synthesis room-temperature nanocrystals raman size
ISSN号	0304-8853
中文摘要	Cobalt ferrite nano-particles were prepared using the co-precipitation method followed by annealing treatment. The formation of nano-particles with different composition, microstructure and sizes were confirmed by X-ray diffraction, Raman, thermogravimetric-differential thermal analysis and transmission electron microscope. The magnetic hysteresis loops measured at room temperature revealed smaller effective magnetic anisotropy constant, coercivity and remanence ratio for the samples prepared by adding the NaOH solutions into the mixed solutions of Co(2+) and Fe(3+) ions due to the formation of Co(3+) ions. A small saturation magnetization and an enhanced coercivity were observed for the nano-particles prepared by adding the mixed solutions of Co(2+) and Fe(3+) ions into the NaOH solutions, which was related to the formation of outer layers with poor crystallization on the surfaces of the cobalt ferrite nano-crystals. Furthermore, the existence of these outer layers induced the oxidation of Co(2+) ions in cobalt ferrite nano-crystals at 200 and 300 degrees C, and led to a large change on the composition and magnetic properties. (C) 2010 Elsevier B.V. All rights reserved.
原文出处	://WOS:000281061400047
公开日期	2012-04-13
内容类型	期刊论文
源URL	[http://210.72.142.130/handle/321006/31732]
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	Y. Zhang,Z. Yang,D. Yin,et al. Composition and magnetic properties of cobalt ferrite nano-particles prepared by the co-precipitation method[J]. Journal of Magnetism and Magnetic Materials,2010,322(21):3470-3475.
APA	Y. Zhang.,Z. Yang.,D. Yin.,Y. Liu.,C. L. Fei.,...&G. L. Yan.(2010).Composition and magnetic properties of cobalt ferrite nano-particles prepared by the co-precipitation method.Journal of Magnetism and Magnetic Materials,322(21),3470-3475.
MLA	Y. Zhang,et al."Composition and magnetic properties of cobalt ferrite nano-particles prepared by the co-precipitation method".Journal of Magnetism and Magnetic Materials 322.21(2010):3470-3475.