Formation and large cryogenic magnetocaloric effect of HoAl(2)/Al(2)O(3) nanocapsules

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	Formation and large cryogenic magnetocaloric effect of HoAl(2)/Al(2)O(3) nanocapsules
	X. G. Liu; B. Li; D. Y. Geng; C. X. Shi; F. Yang; D. J. Kang; Z. D. Zhang
	2009
发表期刊	Journal of Physics D-Applied Physics
ISSN	0022-3727
卷号	42 期号:4
摘要	HoAl(2)/Al(2)O(3) nanocapsules with a core of HoAl(2) and a shell of amorphous Al(2)O(3) have been synthesized. The formation of the rare-earth compound nanocapsules can be ascribed to the different melting points and the optimal proportions of Ho and Al atoms during the arc-discharging process. Furthermore, the formation of the Al(2)O(3) shell protects the rare-earth atoms from serious oxidation. The HoAl(2)/Al(2)O(3) nanocapsules display superparamagnetic properties between the blocking temperature of 6 K and the Curie temperature of 26 K. The absolute value of the magnetic-entropy change in the HoAl(2)/Al(2)O(3) nanocapsules rapidly increases with the decrease in temperature and reaches 14.7 J kg(-1) K(-1) at 3K for a magnetic-field change from 0 to 70 kOe. As a result, this new type of nanocapsule may be applied, in the temperature range studied, in cryogenic magnetic-refrigerator devices.
部门归属	[liu, x. g.] chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, peoples r china. 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
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文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/32122
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	X. G. Liu,B. Li,D. Y. Geng,et al. Formation and large cryogenic magnetocaloric effect of HoAl(2)/Al(2)O(3) nanocapsules[J]. Journal of Physics D-Applied Physics,2009,42(4).
APA	X. G. Liu.,B. Li.,D. Y. Geng.,C. X. Shi.,F. Yang.,...&Z. D. Zhang.(2009).Formation and large cryogenic magnetocaloric effect of HoAl(2)/Al(2)O(3) nanocapsules.Journal of Physics D-Applied Physics,42(4).
MLA	X. G. Liu,et al."Formation and large cryogenic magnetocaloric effect of HoAl(2)/Al(2)O(3) nanocapsules".Journal of Physics D-Applied Physics 42.4(2009).