哈斯勒合金Ni-Fe-Mn-In的马氏体相变与磁特性研究  

Martensitic transformation and magnetic features in Ni-Fe-Mn-In Heusler alloy

作　　者：张元磊[1,2] 李哲[1,2] 徐坤[1,2] 敬超[3] 

机构地区：[1]曲靖师范学院物理与电子工程学院,曲靖655011 [2]云南省高校先进功能材料与低维材料重点实验室,曲靖655011 [3]上海大学物理系,上海200444

出　　处：《物理学报》2015年第6期280-286,共7页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:11364035;11404186;51371111);上海市科委基础研究重点计划(批准号:13JC1402400);云南省科技厅应用基础研究面上项目(批准号:2013FZ110);曲靖师范学院创新团队研究计划(批准号:TD201301)资助的课题~~

摘　　要：利用电弧炉制备了Ni_(50-x)Fe_xMn_(37)In_(13)(x=1,3,5)多晶样品,通过结构和磁性测量,系统分析了Ni_(50-x)Fe_xMn_(37)In_(13)(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3T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9.5J·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).The Ni50-xFexMna7In13（x=1,3,5） polycrystalline samples are prepared by arc melting method. The martensitic transformations and crystal structures for Ni50-xFexMna7In13（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.

关 键 词：哈斯勒合金 马氏体相变 磁电阻效应 磁卡效应 

分 类 号：O469[理学—凝聚态物理]