Co取代NiMnSb Heusler合金的室温巨逆磁热效应
Giant inverse magnetocaloric effect near room temperature in Co substituted NiMnSb Heusler alloys
摘要：
研究了Co对Ni 50-xCoxMn 38 Sb 12（x= 0，2，3，4，5）Heusler合金的结构、磁性和磁热效应的影响。使用X射线衍射，我们显示了从奥氏体相的马氏体相的演变。马氏体相变温度随Co含量的增加而单调降低。在室温附近观察到Co取代后MCE的显著增强。在262 K、50 kOe的磁场中，x=5时磁熵变最大，为34 Jkg-1 K-1，在室温附近为29 Jkg-1 K-1。与逆马氏体相变相关的磁化强度的显着增加是这些化合物中巨大MCE的原因。
英文摘要：
The effect of Co on the structural, magnetic and magnetocaloric effect (MCE) of Ni50-xCoxMn38Sb12 (x=0,2,3,4,5) Heusler alloys was studied. Using x-ray diffraction, we show the evolution of the martensitic phase from the austenite phase. The martensitic transition temperature is found to decrease monotonically with Co concentration. Remarkable enhancement of MCE is observed near room temperature upon Co substitution. The maximum magnetic entropy change of 34 Jkg-1K-1 was achieved in x=5 at 262 K in a field of 50 kOe and a value of 29 Jkg-1K-1 found near room temperature. The significant increase in the magnetization associated with the reverse martensitic transition is responsible for the giant MCE in these compounds.
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