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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
Source PublicationJOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
ISSN1005-0302
Volume34Issue:5Pages:848-854
AbstractThe 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.
description.department[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
KeywordMagnetic Refrigeration Nanoparticles Temperature Transition Coolers
Subject AreaMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
Funding OrganizationNational Natural Science Foundation of China [51271178, 51571195, 51331006, 51590883]
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/79335
Collection中国科学院金属研究所
Corresponding AuthorMa, S (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Liaoning, Peoples R China.
Recommended Citation
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.
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