Synthesis of a new type of GdAl2 nanocapsule with a large cryogenic magnetocaloric effect and novel coral-like aggregates self-assembled by nanocapsules

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	Synthesis of a new type of GdAl2 nanocapsule with a large cryogenic magnetocaloric effect and novel coral-like aggregates self-assembled by nanocapsules
	S. Ma; D. Y. Geng; W. S. Zhang; W. Liu; X. L. Ma; Z. D. Zhang
	2006
发表期刊	Nanotechnology
ISSN	0957-4484
卷号	17 期号:21 页码:5406-5411
摘要	A new type of GdAl2 nanocapsule with single-phase intermetallic compound GdAl2 as the core and amorphous Al2O3 as the shell has been synthesized by the arc-discharge technique with modified strategies. Meanwhile, novel three-dimensional coral-like hierarchical branching macro-aggregates were self-assembled by disordered nanocapsules synthesized simultaneously in the arc-discharge process. The GdAl2 nanocapsules display superparamagnetic properties between their blocking temperature of 100 K and Curie temperature of 162 K. The magnetocaloric effect of the GdAl2 nanocapsules was measured between 5 and 165 K. The absolute value of the change of magnetic entropy of the GdAl2 nanocapsules sharply increases with decreasing temperature and reaches 14.5 J kg(-1) K-1 at 5 K in magnetic fields varying from 0 to 50 kOe. As a result, this new type of nanocapsule can prospectively be applied in cryogenic magnetic refrigerator devices.
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.;ma, s (reprint author), chinese acad sci, shenyang natl lab mat sci, inst met res, 72 wenhua rd, shenyang 110016, peoples r china;songma@imr.ac.cn
关键词	Arc-discharge Magnetic-properties Coated Iron Nanoparticles Co Oxide Nanocrystallites Nanocomposites Encapsulation Nanotrees
URL	查看原文
WOS记录号	WOS:000241856200020
引用统计	被引频次：28[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/321006/34397
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	S. Ma,D. Y. Geng,W. S. Zhang,et al. Synthesis of a new type of GdAl2 nanocapsule with a large cryogenic magnetocaloric effect and novel coral-like aggregates self-assembled by nanocapsules[J]. Nanotechnology,2006,17(21):5406-5411.
APA	S. Ma,D. Y. Geng,W. S. Zhang,W. Liu,X. L. Ma,&Z. D. Zhang.(2006).Synthesis of a new type of GdAl2 nanocapsule with a large cryogenic magnetocaloric effect and novel coral-like aggregates self-assembled by nanocapsules.Nanotechnology,17(21),5406-5411.
MLA	S. Ma,et al."Synthesis of a new type of GdAl2 nanocapsule with a large cryogenic magnetocaloric effect and novel coral-like aggregates self-assembled by nanocapsules".Nanotechnology 17.21(2006):5406-5411.