Abstract
A series of the amorphous Gd75-55Al25-5Fe0–40 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 (−ΔS m) for a field change of 0–5 T reached a maximum value of 7.14 J kg−1 K−1 in the Gd70Al20Fe10 alloy near its Curie temperature (T c) of 149 K. The non-linear composition dependence of (−ΔS 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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Zheng, Z., Zhong, X., Su, K. et al. Magnetic properties and large magnetocaloric effects in amorphous Gd-Al-Fe alloys for magnetic refrigeration. Sci. China Phys. Mech. Astron. 54, 1267–1270 (2011). https://doi.org/10.1007/s11433-011-4363-4
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DOI: https://doi.org/10.1007/s11433-011-4363-4