Magnetic properties and large cryogenic low-field magnetocaloric effect of HoCo(2) nanoparticles without core/shell structure

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	Magnetic properties and large cryogenic low-field magnetocaloric effect of HoCo(2) nanoparticles without core/shell structure
	X. G. Liu; D. Y. Geng; J. J. Jiang; B. Li; S. Ma; D. Li; W. Liu; Z. D. Zhang
	2010
发表期刊	Journal of Nanoparticle Research
ISSN	1388-0764
卷号	12 期号:4 页码:1167-1172
摘要	The HoCo(2) nanoparticles are found to be stable in air without any shell protection. The HoCo(2) nanoparticles display superparamagnetic properties between their blocking temperature of 40 K and Curie temperature of 78 K. The magnetic-entropy change increases with decreasing temperature at a certain magnetic-field change, which is ascribed to the competition between the Zeeman energy and thermal-agitation energy at low temperatures. A large magnetic-entropy change of 19.4 J kg(-1) K(-1) was found at 7.5 K in an applied-field change from 1 to 7 T, while 6.1 J kg(-1) K(-1) was achieved in a low field change of 1 T. HoCo(2) nanoparticles are useful for application of magnetic refrigeration at low temperatures.
部门归属	[liu, x. g.; geng, d. y.; jiang, j. j.; li, b.; ma, s.; li, d.; liu, w.; zhang, z. d.] chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, peoples r china. [liu, x. g.; geng, d. y.; jiang, j. j.; li, b.; ma, s.; li, d.; liu, w.; zhang, z. d.] chinese acad sci, int ctr mat phys, shenyang 110016, peoples r china.;liu, xg (reprint author), chinese acad sci, shenyang natl lab mat sci, inst met res, 72 wenhua rd, shenyang 110016, peoples r china;liuxg@imr.ac.cn
关键词	Nanoparticles Magnetic Properties Magnetocaloric Effect Environment-friendly Refrigeration Behavior
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文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/31319
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	X. G. Liu,D. Y. Geng,J. J. Jiang,et al. Magnetic properties and large cryogenic low-field magnetocaloric effect of HoCo(2) nanoparticles without core/shell structure[J]. Journal of Nanoparticle Research,2010,12(4):1167-1172.
APA	X. G. Liu.,D. Y. Geng.,J. J. Jiang.,B. Li.,S. Ma.,...&Z. D. Zhang.(2010).Magnetic properties and large cryogenic low-field magnetocaloric effect of HoCo(2) nanoparticles without core/shell structure.Journal of Nanoparticle Research,12(4),1167-1172.
MLA	X. G. Liu,et al."Magnetic properties and large cryogenic low-field magnetocaloric effect of HoCo(2) nanoparticles without core/shell structure".Journal of Nanoparticle Research 12.4(2010):1167-1172.