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Great Magnetic Entropy Change in Heusler Alloys Ni-Mn-Ga and NaZn13-Type Compounds La(Fe,Co,M)13, M=Si, Al
Received date: 2002-01-23
Online published: 2002-03-18
Very large magnetic entropy change △S in a wide temperature range was discovered in Heusler alloys Ni-Mn-Ga and NaZn13-type compounds La(Fe,Co,M)13, M=Si, Al. In room temperature range, the achieved △S in both materials significantly exceeds that of Gd and reaches that of Gd5Si2Ge2, which is well known for its giant magnetocaloric effect. The great △S in Heusler alloys Ni-Mn-Ga originates from the first-order martensitic-austensitic structural transition and the giant △S in La(Fe,Co,M13, M=Si, Al is associated with a strong structural and magnetic interplay, characterized by a drastic lattice contraction at Curie temperature T C. The superiority of low cost and giant magnetic entropy change suggests that both Heusler alloys Ni-Mn-Ga and NaZn13-type compounds La(Fe,Co,M13, M=Si, Al are promising candidates for magnetic refrigerants in an extended high temperature range, especially at room temperature.
HU Feng-Xia , SHEN Bao-Gen . Great Magnetic Entropy Change in Heusler Alloys Ni-Mn-Ga and NaZn13-Type Compounds La(Fe,Co,M)13, M=Si, Al[J]. Journal of University of Chinese Academy of Sciences, 2002 , 19(2) : 192 -197 . DOI: 10.7523/j.issn.2095-6134.2002.2.017
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