Magnetocaloric effect in high-energy ball-milled Gd5Si2Ge2 and Gd5Si2Ge2/Fe nanopowders

被引：24
|
作者：
Rajkumar, D. M. [1 ]
Raja, M. Manivel [1 ]
Gopalan, R. [1 ]
Chandrasekaran, V. [1 ]
机构：
[1] Def Met Res Lab, Hyderabad 500058, Andhra Pradesh, India
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2008年 / 320卷 / 08期
关键词：
magnetocaloric effect; Gd-Si-Ge-Fe alloys; ball milling; nanopowders; structural transition; magnetic entropy change;
D O I：
10.1016/j.jmmm.2007.12.005
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Evolution of structure and magnetocaloric properties in ball-milled Gd5Si2Ge2 and Gd5Si2Ge2/0.1wt% Fe nanostructured powders were investigated. The high-energy ball-milled powders were composed of very. ne grains (70-80 nm). Magnetization decreased with milling time due to decrease in the grain size and randomization of the magnetic moments at the surface. The magnetic entropy change (Delta S-M) was calculated from the isothermal magnetization curves and a maximum value of 0.45 J/kgK was obtained for 32h milled Gd5Si2Ge2 alloy powder for a magnetic field change of 2T while it was still low in Fe-contained alloy powders. The thermo-magnetic measurements revealed that the milled powders display distribution of magnetic transitions, which is desirable for practical magnetic refrigerant to cover a wide temperature span. (c) 2008 Elsevier B.V. All rights reserved.
引用
收藏
页码：1479 / 1484
页数：6
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