Magnetocaloric effect in spherical La(FexSi1-x)13 and their hydrides for active magnetic regenerator-type refrigerator

被引：34
作者：
Fujita, A. [1 ]
Koiwai, S.
Fujieda, S. [1 ]
Fukamichi, K. [2 ]
Kobayashi, T. [3 ]
Tsuji, H. [3 ]
Kaji, S. [3 ]
Saito, A. T. [3 ]
机构：
[1] Tohoku Univ, Grad Sch Engn, Dept Mat Sci, Aoba Yama 02, Sendai, Miyagi 9808579, Japan
[2] Tohoku Univ, Inst Multidisciplinary Res Adv Mat, Sendai, Miyagi 9808577, Japan
[3] Toshiba Co Ltd, Corp Res & Dev Ctr, Kawasaki, Kanagawa 2128582, Japan
来源：
JOURNAL OF APPLIED PHYSICS | 2009年 / 105卷 / 07期
关键词：
TRANSITION;
D O I：
10.1063/1.3070658
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We have fabricated spherical La(FexSi1-x)(13) compounds by a rotating electrode process (REP) to provide suitable refrigerants for active magnetic regenerator (AMR)-type systems. In the as-prepared state, the cross section exhibits a dendritic metallographic structure composed of two phases of alpha-Fe-based alloy with Si and LaFeSi equiatomic compound. After annealing at 1323 K for 5 days, the spheres become a single phase of La(FexSi1-x)(13). From the temperature dependence of magnetic entropy change for the hydrogenated spheres, it has been confirmed that the hydrogen concentration in the spheres is homogeneous. In addition, it has also been demonstrated that the itinerant-electron metamagnetic transition appears in the spheres with the higher Fe concentration. Consequently, the spherical La(FexSi1-x)(13) fabricated by the REP are suitable for AMR-type refrigerations. (c) 2009 American Institute of Physics. [DOI: 10.1063/1.3070658]
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页数：3
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