强磁场凝固的MnCoSi基磁致伸缩材料
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摘要：
MnCoSi合金在磁场驱动的反铁磁相到铁磁相的变磁性相变过程中伴随着较大的晶格畸变,预示着这类合金是潜在的磁致伸缩材料.通过掺杂少量Ni元素将MnCoSi基合金的三相点调节到290K,同时降低变磁性相变的临界磁场.利用强磁场凝固制备出取向并且致密的Mn0.98Ni0.02CoSi合金块材.观察到室温附近低场可逆的各向异性大磁致伸缩效应,尤其在300K时2T磁场作用下的磁致伸缩达到0.19%.该研究为拓宽磁相变合金以及强磁场的应用领域提供了实验依据.
In MnCoSi alloy,a metamagnetic transition from an antiferromagnetic phase to a ferromagnetic phase is triggered by magnetic field,accompanied by larger lattice distortion,indicating that this alloy is a potential magnetostrictive material.In this paper,tricritical point of MnCoSi was adjusted to 290 K and critical magnetic field of the metamagnetic transition was obviously reduced by doping a small amount of Ni.Then,the oriented and dense Mn 0.98 Ni 0.02 CoSi alloy which was prepared by high magnetic field solidification was obtained.The reversible large magnetostrictive effects with anisotropy under low field near room temperature were observed.In particular,the magnetostriction reached 0.19%under the magnetic field of 2 T at 300 K.These research results provide an experimental basis for broadening the application fields of magnetic transition alloy and high magnetic field.
作者：
胡秋波 陈林峰 程春晓 王晓飞 张永胜
Hu Qiubo;Chen Linfeng;Cheng Chunxiao;Wang Xiaofei;Zhang Yongsheng(Department of Mathematics and Physics,Luoyang Institute of Science and Teleology,Luoyang 471023,China;Henan Key Laboratory of Photoelectric Energy Storage Materials and Applications,Henan University of Science and Technology,Luoyang 471000,China;National Laboratory of Solid State Microstructures,Nanjing University,Nanjing 210093,China)
机构地区：
洛阳理工学院数学与物理教学部 河南科技大学河南省光电储能材料与应用重点实验室 南京大学固体微结构国家重点实验室
出处：
《betway官方app 学报：自然科学版》 CAS 北大核心 2021年第3期46-51,共6页
基金：
国家自然科学基金(51801092) 河南省科技攻关项目(212102210449) 河南省高等学校重点科研项目(19A140005) 河南省光电储能材料与应用重点实验室开放基金(PEMSA01) 南京大学固体微结构国家重点实验室开放课题(M31035,M32058).
关键词：
磁致伸缩 变磁性相变 临界磁场 三相点 强磁场
magnetostiction metamagnetic transition critical magnetic field tricritical point high magnetic field
分类号：
O469 [理学—凝聚态物理]
