Journal of Jilin University(Engineering and Technology Edition) ›› 2021, Vol. 51 ›› Issue (6): 2007-2012.doi: 10.13229/j.cnki.jdxbgxb20200627

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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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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

CLC Number: 

  • TM273

Fig.1

Schematic diagram of assembly section ofmolybdenum cup cavity"

Fig.2

DTA spectra of samples with different atomic ratio"

Table 1

Phase transition temperature of sampleswith different atomic ratio"

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

Fig.3

XRD spectra of samples at differentsintering time"

Fig.4

Grain size of samples at different sintering time"

Fig.5

XRD spectra of samples with differentatomic ratio"

Fig.6

Grain size of samples with different atomic ratio"

Fig.7

Hysteresis loops of samples"

Table 2

Specific saturation magnetization andcoercivity of samples"

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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