Magnetic properties of Dy nanoparticles and Al2O3-coated Dy nanocapsules

doi:10.1007/s11051-010-0108-y

IMR OpenIR

	Magnetic properties of Dy nanoparticles and Al2O3-coated Dy nanocapsules
	Liu, X. G.1,2,3,4; Or, S. W.3; Li, B.1,2; Ou, Z. Q.4; Zhang, L.4; Zhang, Q.1,2; Geng, D. Y.1,2; Yang, F.1,2; Li, D.1,2; Bruck, E.4; Zhang, Z. D.1,2
通讯作者	Liu, X. G.(liuxianguohugh@gmail.com)
	2011-03-01
发表期刊	JOURNAL OF NANOPARTICLE RESEARCH
ISSN	1388-0764
卷号	13 期号:3 页码:1163-1174
摘要	Dy2O3-coated Dy nanoparticles and Al2O3-coated Dy nanocapsules, with Dy cores with the average size of 3.6 and 17.6 nm, respectively, are synthesized by arc-discharge technique. The transition from ferromagnetism to antiferromagnetism absents in the Dy nanoparticles, due to that its average core size of 3.6 nm is smaller than the helix period of Dy. The temperature of the superparamagnetism-antiferromagnetism transition in the Dy nanocapsules increases abnormally to 105 K, while the N,el temperature decreases to 150 K. The magnetic-entropy change (-a dagger S (m)) of the Dy nanoparticles rapidly increases with decreasing temperature. For Al2O3-coated Dy nanocapsules, -a dagger S (m) reaches 15.2 J kg(-1) K-1 at 7.5 K, due to the existence of superparamagnetism, and a peak (5.2 J kg(-1) K-1) appears at 105 K due to the superparamgantism-antiferromagnetism transition, and -a dagger S (m) exceeds 2 J kg(-1) K-1 in the temperature range from 7.5 to 105 K, for a field change from 1 to 5 T.
关键词	Nanoparticles Magnetic properties Size effect Rare-earth metals
资助者	Science Exchange Program ; Ministry of Science and Technology of China ; National Natural Science Foundation of China ; Hong Kong Polytechnic University
DOI	10.1007/s11051-010-0108-y
收录类别	SCI
语种	英语
资助项目	Science Exchange Program ; Ministry of Science and Technology of China[2010CB934603] ; National Natural Science Foundation of China[50701045] ; Hong Kong Polytechnic University[G-YX3 V]
WOS研究方向	Chemistry ; Science & Technology - Other Topics ; Materials Science
WOS类目	Chemistry, Multidisciplinary ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary
WOS记录号	WOS:000289003000025
出版者	SPRINGER
引用统计	被引频次：7[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/321006/106789
专题	中国科学院金属研究所
通讯作者	Liu, X. G.
作者单位	1.Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Peoples R China 2.Chinese Acad Sci, Int Ctr Mat Phys, Shenyang 110016, Peoples R China 3.Hong Kong Polytech Univ, Dept Elect Engn, Kowloon, Hong Kong, Peoples R China 4.Delft Univ Technol, Fundamental Aspects Mat & Energy Grp, Fac Sci Appl, NL-2629 JB Delft, Netherlands
推荐引用方式 GB/T 7714	Liu, X. G.,Or, S. W.,Li, B.,et al. Magnetic properties of Dy nanoparticles and Al2O3-coated Dy nanocapsules[J]. JOURNAL OF NANOPARTICLE RESEARCH,2011,13(3):1163-1174.
APA	Liu, X. G..,Or, S. W..,Li, B..,Ou, Z. Q..,Zhang, L..,...&Zhang, Z. D..(2011).Magnetic properties of Dy nanoparticles and Al2O3-coated Dy nanocapsules.JOURNAL OF NANOPARTICLE RESEARCH,13(3),1163-1174.
MLA	Liu, X. G.,et al."Magnetic properties of Dy nanoparticles and Al2O3-coated Dy nanocapsules".JOURNAL OF NANOPARTICLE RESEARCH 13.3(2011):1163-1174.