Synthesis, structure and magnetic properties of Fe-Gd nanocapsules coated with B2O3/H3BO3 and Fe3BO5+GdBO3

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	Synthesis, structure and magnetic properties of Fe-Gd nanocapsules coated with B2O3/H3BO3 and Fe3BO5+GdBO3
	P. Z. Si; E. Bruck; Z. D. Zhang; O. Tegus; K. H. J. Buschow; W. S. Zhang; J. C. P. Klaasse; F. R. de Boer
	2004
发表期刊	Physica B-Condensed Matter
ISSN	0921-4526
卷号	353 期号:1-2 页码:40916
摘要	Nanocapsules consisting of B2O3/H3BO3 encapsulating Fe-Gd cores have been synthesized by an arc-discharge process using metal-boron alloys as cathode. Most of the nanocapsules have a well-constructed shell/core structure with a uniform B2O3/H3BO3 shell. Heat-treatment induces reactions between the shell and the core, resulting in the formation of a Fe3BO5+GdBO3 matrix embedded with Fe nanoparticles, reduction of the metallic-core size and decrease of the blocking temperature T-B. Above T-B, the magnetization curves plotted vs. H/T overlap and show zero coercivity. Below T-B, the coercivity shows a linear dependence when plotted vs. T-1/2. However, the coercivity-T-1/2 curve below 60 K has a different slope from that above 60 K, indicating the existence of two different magnetic phases in the nanocapsules. Different from bulk Fe3BO5, nanoscale Fe3BO5 particles have a lower transition temperature to the weak-ferromagnetic state. and magnetic hysteresis is absent due to size effects. (C) 2004 Elsevier B.V. All rights reserved.
部门归属	chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, peoples r china. chinese acad sci, int ctr mat phys, shenyang 110016, peoples r china. univ amsterdam, van der waals zeeman inst, nl-1018 xe amsterdam, netherlands.;si, pz (reprint author), chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, peoples r china;psi@science.uva.nl
关键词	Nanocapsules Transmission Electron Microscopy (Tem) X-ray Photoelectron Spectroscopy (Xps) Magnetic Properties Arc-discharge Boric-acid Boron Carbon Oxide Nanoparticles Particles Diborane Iron
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WOS记录号	WOS:000225502300001
引用统计	被引频次：21[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/321006/35546
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	P. Z. Si,E. Bruck,Z. D. Zhang,et al. Synthesis, structure and magnetic properties of Fe-Gd nanocapsules coated with B2O3/H3BO3 and Fe3BO5+GdBO3[J]. Physica B-Condensed Matter,2004,353(1-2):40916.
APA	P. Z. Si.,E. Bruck.,Z. D. Zhang.,O. Tegus.,K. H. J. Buschow.,...&F. R. de Boer.(2004).Synthesis, structure and magnetic properties of Fe-Gd nanocapsules coated with B2O3/H3BO3 and Fe3BO5+GdBO3.Physica B-Condensed Matter,353(1-2),40916.
MLA	P. Z. Si,et al."Synthesis, structure and magnetic properties of Fe-Gd nanocapsules coated with B2O3/H3BO3 and Fe3BO5+GdBO3".Physica B-Condensed Matter 353.1-2(2004):40916.