Welcome to Journal of University of Chinese Academy of Sciences,Today is

›› 2002, Vol. 19 ›› Issue (2): 192-197.DOI: 10.7523/j.issn.2095-6134.2002.2.017

Previous Articles     Next Articles

Great Magnetic Entropy Change in Heusler Alloys Ni-Mn-Ga and NaZn13-Type Compounds La(Fe,Co,M)13, M=Si, Al

HU Feng-Xia, SHEN Bao-Gen   

  1. State Key Laboratory of Magnetism,Institute of Physics & Center of Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080
  • Received:2002-01-23 Online:2002-03-18

Abstract:

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.

Key words: magnetic entropy change, magnetic refrigerant, Husler alloys Ni-Mn-Ga, NaZn 13-type compounds

CLC Number: