烧结淬冷MnBi合金的相变和磁性  

Phase transformation and magnetic properties of MnBi alloys by sintered and quenched

作　　者：鄂元龙[1] 贾洪声[1] 杨鑫炫 李东飞[1] 刘梅[1] 李海波[1] E Yuan-long;JIA Hong-sheng;YANG Xin-xuan;LI Dong-fei;LIU Mei;LI Hai-bo(Key Laboratory of Functional Materials Physics and Chemistry,Ministry of Education,Jilin Normal University,Siping 136000,China)

机构地区：[1]吉林师范大学功能材料物理与化学教育部重点实验室,吉林四平136000

出　　处：《吉林大学学报（工学版）》2021年第6期2007-2012,共6页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家自然科学基金项目(21371071);吉林省科技发展计划项目(20180201079GX,20200201236JC);吉林省教育厅“十三五”科学技术项目(JJKH20191003KJ)。

摘　　要：采用密封低温烧结再淬冷的方法制备了高纯度MnBi合金。利用差热分析仪(DTA)分析烧结过程中Mn-Bi的相变。利用X射线衍射仪(XRD)和振动样品磁强计(VSM)分析了烧结样品的物相和磁性。结果表明:n(Bi)∶n(Mn)为1∶1.3,275℃下烧结20 h后淬冷可获得高纯度的低温相MnBi合金块体材料;温度为50~350 K时,磁化强度随温度的升高而减小,矫顽力Hc和剩余磁化强度Mr先减小后增大;温度低于200 K时,随着温度的降低,样品趋近饱和;温度为50 K时,样品的饱和磁化强度为78.0 Am^(2)/kg。本文制备工艺简单且可实现该合金的批量生产,对制备新型合金材料具有重要的参考价值。High-pure MnBi alloy was successfully synthesized by closed cryogenic sintering and then rapid quenching method. The phase transformation of the Mn-Bi samples in the sintering process were studied by differential thermal analyzer(DTA). The phases and magnetic properties of the samples were characterized by X-ray diffractometer(XRD) and vibration sample magnetometer(VSM). The results show that the lowtemperature phase MnBi alloy block material with high purity can be obtained at 1∶1.3(n(Bi)∶n(Mn)),275 ℃, 20 h. At 50~350 K, the magnetization decreases with the increasing of temperature, and the coercivity Hc and residual magnetization Mr decrease firstly and then increase. When the temperature is lower than 200 K, the sample is more likely to approach saturation with the decrease of temperature. At 50 K, the saturation magnetization of the sample is 78.0 Am^(2)/kg. The preparation process used in this research is simple and the quantity production of alloy can be realized, which has an important reference value for the preparation of the new type alloy material.

关 键 词：MnBi合金 烧结 相变 磁性 

分 类 号：TM273[一般工业技术—材料科学与工程]