摘要:
利用电弧炉制备了Ni50?xFexMn37In13(x =1,3,5)多晶样品,通过结构和磁性测量,系统分析了Ni50?xFexMn37In13(x=1,3,5)样品的晶体结构和马氏体相变.结果表明,三样品在室温下呈现出了不同的晶体结构.同时,随着Fe含量的增加,样品的马氏体相变温度急剧下降,而铁磁性却逐渐增强.研究了Fe3和Fe5样品在反马氏体相变过程中的磁电阻和磁卡效应.在外加3 T的磁场下,两样品在反马氏体相变区域所表现出的磁电阻效应分别约为?46%和?15%,而等温熵变则约为6 J·kg?1·K?1和9.5 J·kg?1·K?1.然而,伴随非常宽的相变温跨和较小的磁滞损失, Fe3样品在反马氏体相变区域的净制冷量达到96 J·kg?1.
Abstract:
The Ni50?xFexMn37In13(x=1, 3, 5) polycrystalline samples are prepared by arc melting method. The martensitic transformations and crystal structures for Ni50?xFexMn37In13(x = 1, 3, 5) samples are systematically analyzed by measuring the structure and magnetism. The results show that the three samples present different structures at room temperature. In the mean time, with the increase of the content of Fe, the martensitic transformation temperature rapidly decreases, while the ferromagnetism is gradually enhanced for these alloys. Furthermore, both the magnetoresistance and the magnetocaloric effect are also investigated in Fe3 and Fe5 alloys. For an applied magnetic field of 3 T, it is found that the magnetoresistance effects of two samples are about ?46% and ?15%, while their isothermal entropy changes are about 6 J·kg?1 and 9.5 J·kg?1·K?1 during reverse martensitic transformation, respectively. Accompanied with the disappearing of a very wide transforming range and a slight magnetic hysteresis loss, the net refrigerating capacity of Fe3 sample reaches 96 J·kg?1 in the process of reverse martensitic transformation.
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