Experimental Study of Magnetocaloric Effect in Ni-Fe-Mn-Ga and Ni-Co-Mn-Ga Heusler Alloys
Experimental Study of Magnetocaloric Effect in Ni-Fe-Mn-Ga and Ni-Co-Mn-Ga Heusler Alloys
复制标题
Ni-Fe-Mn-Ga和Ni-Co-Mn-Ga Heusler合金磁热效应的实验研究
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
V. Khovaylo
中科院分区：
文献类型：
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作者：
R. Fayzullin;V. Buchelnikov;S. Taskaev;Mikhail Drobosyuk;V. Khovaylo
在本工作中，我们实验研究了Heusler合金Ni2.19-xFexMn0.81Ga(x=0.01，0.02，0.03，0.04)和Ni2.16-xCoxMn0.84Ga(x=0.03，0.06，0.09)中的MCE。使用AMT&C公司的装置，用直接方法测量了磁热效应。测量了∆Tad随磁场变化∆H=2T的温度依赖关系。相变温度是由原始装置利用霍尔效应测量的低场磁化强度的温度关系确定的。研究表明，当x=0.01，0.02时，Fe原子取代Ni原子后，磁结构转变的温度略有降低，从x=0.03开始，磁性转变和结构转变分别发生，随着Fe含量的进一步增加，居里温度升高，而温度马氏体相变降低。当用Co原子取代Ni原子时，马氏体相变温度和居里温度升高。
In this work we experimentally studied the MCE in the Heusler alloys Ni2.19-xFexMn0.81Ga (x = 0.01, 0.02, 0.03, 0.04) and Ni2.16-xCoxMn0.84Ga (x = 0.03, 0.06, 0.09). Magnetocaloric effect was measured by the direct method using the installation from the company AMT&C. The temperature dependencies of ∆Tad for the magnetic field change ∆H = 2 T were measured. The phase transition temperatures were determined from temperature dependencies of low field magnetization measured by original setup using Hall effect. Studies have shown that replacement of the Ni atoms with the iron atoms slightly reduces the temperature magnetostructural transition for x = 0.01,0.02, and starting with x = 0.03, magnetic and structural transitions occur separately and a further increase in iron concentration leads to the Curie temperature increase, while the temperature martensitic transformation decreases. When replacing the Ni atoms with the Co atoms of the martensitic transformation temperature and Curie temperature increase.