Heusler合金Ni-Mn-Ga和NaZn13型化合物La（Fe,Co,M）13,M=Si,Al的巨大磁熵变（英）

doi:10.7523/j.issn.2095-6134.2002.2.017

中国科学院大学学报 ›› 2002, Vol. 19 ›› Issue (2): 192-197.DOI: 10.7523/j.issn.2095-6134.2002.2.017

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Heusler合金Ni-Mn-Ga和NaZn₁₃型化合物La（Fe,Co,M）₁₃,M=Si,Al的巨大磁熵变（英）

胡凤霞, 沈保根

中国科学院物理研究所凝聚态物理中心国家磁学重点实验室, 北京 100080

收稿日期:2002-01-23 发布日期:2002-03-18
作者简介:HU Fen-Xia,female,born in September 1965,Doctor
基金资助:
supportedbytheStateKeyProjectofFundamentalResearch,theNationalNaturalScienceFoundationofChinaandtheBeijingNaturalScienceFoundationofChina.

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

State Key Laboratory of Magnetism,Institute of Physics & Center of Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080

Received:2002-01-23 Published:2002-03-18

摘要/Abstract

摘要：

在Heusler合金Ni Mn Ga和NaZn₁₃型化合物La(Fe,Co,M)₁₃,M =Si,Al中很宽温度区间发现巨大磁熵变△S。这两种材料在室温区的磁熵变△S均显著地超过单质稀土Gd并达到著名的磁热效应材料Gd₅Si₂Ge₂ 合金的磁熵变幅度.Heusler合金Ni Mn Ga中的巨大磁熵变来源于具有一级相变特征的马氏结构相变。NaZn₁₃型化合物La(Fe,Co,M)₁₃,M =Si,Al中异常巨大的磁熵变与合金中的强的磁晶耦合相关,表现为居里温度附近晶格的巨大负膨胀。材料的低价格和其巨大磁熵变表明,Heusler合金Ni Mn Ga和NaZn1 3型化合物La(Fe,Co,M)₁₃,M =Si,Al在很宽的高温区,尤其在室温区作为磁制冷工质非常有吸引力。

关键词: 磁熵变, 磁制冷, Heusler合金NiMnGa, NaZn13型化合物

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

中图分类号:

O482.54

胡凤霞, 沈保根. Heusler合金Ni-Mn-Ga和NaZn₁₃型化合物La（Fe,Co,M）₁₃,M=Si,Al的巨大磁熵变（英）[J]. 中国科学院大学学报, 2002, 19(2): 192-197.

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]. , 2002, 19(2): 192-197.

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Heusler合金Ni-Mn-Ga和NaZn₁₃型化合物La（Fe,Co,M）₁₃,M=Si,Al的巨大磁熵变（英）

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

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