A new scale for optimized cryogenic magnetocaloric effect in ErAl2@Al2O3 nanocapsules

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	A new scale for optimized cryogenic magnetocaloric effect in ErAl2@Al2O3 nanocapsules
	Wei, F; Ma, S; Yang, L; Feng, Y; Wang, JZ; Hua, A; Zhao, XG; Geng, DY; Zhang, ZD; Ma, S (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Liaoning, Peoples R China.
	2018-05-01
发表期刊	JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
ISSN	1005-0302
卷号	34 期号:5 页码:848-854
摘要	The ErAl2@Al2O3 nanocapsules with ErAl2 core and Al2O3 shell were synthesized by modified warc-charge technique. The typical core-shell structure of the nanocapsules was confirmed by high resolution transmission electron microscopy and X-ray photoelectron spectroscopy. Transmission electron microscopy analysis shows the irregular sphere of the nanocapules with an average diameter of 26 nm. Magnetic investigation revealed the Curie temperature of ErAl2@Al2O3 nanocapsules at 20 K and the typical superparamagnetic behavior between blocking temperature and Curie temperature. Based on the blocking temperature and average diameter, the magnetocrystalline anisotropy constant of ErAl2@Al2O3 nanocapsules was estimated to illustrate the magnetic contribution to the -Delta S-M. The large -Delta S-M of 14.25 J/(kg K) was obtained under 50 kOe at 5 K. A vital parameter beta was introduced in the present work to scale the optimized magnetic characteristics and the optimized mechanism was discussed in detail according to classical superparamagnetic theory. The results demonstrate that the optimal -Delta S-M will be obtained when the magnetic parameter beta is close to the theoretical coefficient. (C) 2017 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.; The ErAl2@Al2O3 nanocapsules with ErAl2 core and Al2O3 shell were synthesized by modified warc-charge technique. The typical core-shell structure of the nanocapsules was confirmed by high resolution transmission electron microscopy and X-ray photoelectron spectroscopy. Transmission electron microscopy analysis shows the irregular sphere of the nanocapules with an average diameter of 26 nm. Magnetic investigation revealed the Curie temperature of ErAl2@Al2O3 nanocapsules at 20 K and the typical superparamagnetic behavior between blocking temperature and Curie temperature. Based on the blocking temperature and average diameter, the magnetocrystalline anisotropy constant of ErAl2@Al2O3 nanocapsules was estimated to illustrate the magnetic contribution to the -Delta S-M. The large -Delta S-M of 14.25 J/(kg K) was obtained under 50 kOe at 5 K. A vital parameter beta was introduced in the present work to scale the optimized magnetic characteristics and the optimized mechanism was discussed in detail according to classical superparamagnetic theory. The results demonstrate that the optimal -Delta S-M will be obtained when the magnetic parameter beta is close to the theoretical coefficient. (C) 2017 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
部门归属	[wei, f. ; ma, s. ; yang, l. ; feng, y. ; wang, j. z. ; hua, a. ; zhao, x. g. ; geng, d. y. ; zhang, z. d.] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, liaoning, peoples r china
关键词	Magnetic Refrigeration Nanoparticles Temperature Transition Coolers
学科领域	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
资助者	National Natural Science Foundation of China [51271178, 51571195, 51331006, 51590883]
收录类别	SCI
语种	英语
WOS记录号	WOS:000430310900016
引用统计	被引频次：6[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/321006/79335
专题	中国科学院金属研究所
通讯作者	Ma, S (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Liaoning, Peoples R China.
推荐引用方式 GB/T 7714	Wei, F,Ma, S,Yang, L,et al. A new scale for optimized cryogenic magnetocaloric effect in ErAl2@Al2O3 nanocapsules[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2018,34(5):848-854.
APA	Wei, F.,Ma, S.,Yang, L.,Feng, Y.,Wang, JZ.,...&Ma, S .(2018).A new scale for optimized cryogenic magnetocaloric effect in ErAl2@Al2O3 nanocapsules.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,34(5),848-854.
MLA	Wei, F,et al."A new scale for optimized cryogenic magnetocaloric effect in ErAl2@Al2O3 nanocapsules".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 34.5(2018):848-854.