화학공학소재연구정보센터
Materials Chemistry and Physics, Vol.180, 279-283, 2016
Magnetocaloric properties of GdFe0.83Al3.02 multiphase alloy having multiple magnetic transitions
The structural, magnetic and magnetocaloric properties of the multiphase alloy GdFe0.83Al3.02 have been investigated. This alloy crystallises in two different phases such as hexagonal GdFe3.89Al7.56 (approximate to GdFe4Al8) and cubic GdAl2, respectively, offers successive ferromagnetic transition at T-1 = 36.5 K and T-2 = 169 K. The maximum reversible - Delta S-M values 2.3 and 1.6 J/kg K are found at T-1 = 36.5 K and T-2 = 169 K, respectively for a field change of 0-5 T. The overlap of these peaks with a minimum -Delta S-M value of 1.2 J/kg K significantly enlarges the working temperature span with substantial magnetocaloric effect. Hence, the results on GdFe0.83Al3.02 show that the materials with sequential ferromagnetic transitions originating from the two different phases may create a new class of magnetocaloric materials as they could work in a broader temperature range than the conventional refrigerant materials. (C) 2016 Published by Elsevier B.V.