A new scale for optimized cryogenic magnetocaloric effect in ErAl2@Al2O3 nanocapsules
文献类型：期刊论文
| 作者 | 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. |
| 刊名 | JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
 |
| 出版日期 | 2018-05-01 |
| 卷号 | 34期号:5页码:848-854 |
| ISSN号 | 1005-0302 |
| 关键词 | Magnetic Refrigeration Nanoparticles Temperature Transition Coolers |
| 英文摘要 | 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. |
| 学科主题 | Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering |
| 语种 | 英语 |
| 资助机构 | National Natural Science Foundation of China [51271178, 51571195, 51331006, 51590883] |
| 公开日期 | 2018-06-05 |
| 源URL | [http://ir.imr.ac.cn/handle/321006/79335]  |
| 专题 | 金属研究所_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. |
入库方式： OAI收割
来源：金属研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。