吉林大学学报(工学版) ›› 2021, Vol. 51 ›› Issue (6): 2007-2012.doi: 10.13229/j.cnki.jdxbgxb20200627

• 材料科学与工程 • 上一篇    

烧结淬冷MnBi合金的相变和磁性

鄂元龙(),贾洪声(),杨鑫炫,李东飞,刘梅,李海波   

  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
  • 收稿日期:2020-05-16 出版日期:2021-11-01 发布日期:2021-11-15
  • 通讯作者: 贾洪声 E-mail:eyaunlong@jlnu.edu.cn;jiahs@jlnu.edu.cn
  • 作者简介:鄂元龙（1987-），男，实验师，硕士. 研究方向：磁性功能材料. E-mail：eyaunlong@jlnu.edu.cn
  • 基金资助:
    国家自然科学基金项目(21371071);吉林省科技发展计划项目(20180201079GX);吉林省教育厅“十三五”科学技术项目(JJKH20191003KJ)

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

Yuan-long E(),Hong-sheng JIA(),Xin-xuan YANG,Dong-fei LI,Mei LIU,Hai-bo LI   

  1. Key Laboratory of Functional Materials Physics and Chemistry，Ministry of Education，Jilin Normal University，Siping 136000，China
  • Received:2020-05-16 Online:2021-11-01 Published:2021-11-15
  • Contact: Hong-sheng JIA E-mail:eyaunlong@jlnu.edu.cn;jiahs@jlnu.edu.cn

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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 Am2/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。

关键词: MnBi合金, 烧结, 相变, 磁性

Abstract:

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 low-temperature 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 Am2/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.

Key words: MnBi alloy, sinter, phase transformation, magnetic properties

中图分类号: 

  • TM273

图1

钼杯腔体组装截面示意图"

图2

不同原子比样品的DTA图谱"

表1

不同原子比样品的相变温度"

相变温度n（Bi）/n（Mn）
1∶11∶1.31∶1.5
T1/℃267.7267.9267.6
T2/℃274.2274.9275.1
T3/℃312.3332.2342.5

图3

不同烧结时间样品的XRD图谱"

图4

不同烧结时间下样品的晶粒尺寸"

图5

不同原子比样品的XRD图谱"

图6

不同原子比样品的晶粒尺寸"

图7

样品的磁滞回线"

表2

样品的磁性参数"

测试温度/K
50100150200250300350

矫顽力/

（kA·m-1）

4.02.22.510.518.732.178.9
剩余磁化强度/（Am2·kg-1）3.12.22.35.48.412.821.8
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