期刊
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
卷 54, 期 7, 页码 1267-1270出版社
SCIENCE PRESS
DOI: 10.1007/s11433-011-4363-4
关键词
Gd-Fe-Al; amorphous ribbon; magnetocaloric effect
资金
- Guangdong Provincial Science and Technology Program [2010B050300008, 2007B010600043]
- South China University of Technology [2009ZM0291]
A series of the amorphous Gd(75-55)Al(25-5)Fe(0-40) alloy ribbons were prepared by melt spinning. The structure, magnetic properties and magnetocaloric effect (MCE) of these alloys were investigated. The prepared samples have shown the characteristics of a second-order phase transition with zero hysteresis loss and the T (c) can be tuned by changing the Fe contents. For the different compositions, the magnetic entropy change (-Delta S (m)) for a field change of 0-5 T reached a maximum value of 7.14 J kg(-1) K(-1) in the Gd(70)Al(20)Fe(10) alloy near its Curie temperature (T (c)) of 149 K. The non-linear composition dependence of (-Delta S (m)) could be caused by the competitions between Fe-Fe, Fe-Gd and Gd-Gd interactions. The refrigeration capacity (RC) values of these alloys are about 532-780 J/kg under a magnetic field change of 0-5 T. The results indicate that amorphous GdFeAl alloys can be considered as ideal candidates for a magnetic refrigerant in the temperature range of 104-222 K.
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