Preparation and magnetic properties of anisotropic MnBi powders

Li, Bingbing; Ma, Yi; Shao, Bin; Li, Chunhong; Chen, Dengming; Sun, Jianchun; Zheng, Qiang; Yin, Xiaobo

doi:10.1016/j.physb.2017.11.085

Cited by 19 publications

(7 citation statements)

References 37 publications

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“…By applying a force of 1 ton, the compressed substance is obtained. The compressed samples have a packing density of around 8.61 g/cm 3 with a radius of 0.3 cm and a height of 0.41 cm. It is noted that the sample ID is denoted by sintering time and pressing conditions (C for compressed, NC for non-compressed).…”

Section: Sample Preparationmentioning

confidence: 99%

“…All samples in this experiment were measured for magnetism and were prepared by filling MnBi powder in the standard VSM sample holder. There is a packing density of 6.366 g/cm 3 with the same N value of 0.432.…”

Section: Sample Preparation For Vsm Measurementsmentioning

confidence: 99%

“…On the other hand, materials containing these rare earth elements have apparent drawbacks, such as poor corrosion resistance and magnetic property loss as the temperature increases [3]. In addition, rare earth elements, especially Nd and Sm, are suffering from the supply crisis and mining mobilization.…”

Section: Introductionmentioning

confidence: 99%

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Effects of compression on magnetic properties of MnBi prepared by liquid-phase sintering

Juntree

Eknapakul

Pinitsoontorn

et al. 2023

J. Phys.: Conf. Ser.

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In this work, the Mn and Bi mixture prepared with and without compression were sintered in a vacuum at 325°C and cooled down naturally to obtain low-temperature phase MnBi. For non-compressed samples, the MnBi content increases with sintering time which could be described by the diffusion process. The average maximum energy product ((BH)max) values were 3.67, 3.05, and 4.77 MGOe for MnBi sintered for 24, 48, and 96 hr, respectively, consistent with their phase identifications. For the compressed samples, the MnBi phase is significantly low in the 24-hr sintered samples compared to the samples sintered for 48 and 96 hr. This resulted in an average (BH)max of 0.43, 3.90, and 3.23 MGOe for the compressed samples sintered for 24, 48 and 96 hr, respectively. The results suggest that compression of the Mn and Bi mixture affects the flow of liquid Bi during sintering and, thus, hinders the formation of MnBi. The effects of the compression were reduced for the prolonged sintered samples, suggesting changes in the internal structure as the sintering proceeded.

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Section: Sample Preparationmentioning

confidence: 99%

Section: Sample Preparation For Vsm Measurementsmentioning

confidence: 99%

See 1 more Smart Citation

Effects of compression on magnetic properties of MnBi prepared by liquid-phase sintering

Juntree

Eknapakul

Pinitsoontorn

et al. 2023

J. Phys.: Conf. Ser.

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“…Moreover, the record of magnetization 71.2 emu/g has been achieved via milling for 8 h, heat treated, and ball milled for extra half an hour process. Li et al [19] studied the magnetic properties of anisotropic MnBi powders after LEBM performed in heptane, coercivity increases to 16.1 kOe at 5 h. The coercivity reaches a maximum of 16.2 kOe after 35 min of surfactant assisted low-energy ball milling (SALEBM) for MnBi particles obtained by Kanari et al [20]. There is still a room to improve the coercvity of MnBi after ball milling.…”

Section: Ofmentioning

confidence: 99%

Microstructure and Magnetic Properties of Mn55Bi45 Powders Obtained by Different Ball Milling Processes

Dong

Xiang

et al. 2019

Metals

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Low-temperature phase (LTP) MnBi is considered as a promising rare-earth-free permanent magnetic material with high coercivity and unique positive temperature coefficient of coercivity. Mn55Bi45 ribbons with high purity of LTP MnBi phase were prepared by melt spinning. Then, Mn55Bi45 powders with different particle size were obtained by low-energy ball milling (LEBM) with and without added surfactant. The coercivity is enhanced in both cases. Microstructure characterization reveals that Mn55Bi45 powders obtained by surfactant assisted low-energy ball milling (SALEBM) have better particle size uniformity and show higher decomposition of LTP MnBi. Coercivity can achieve a value of 17.2 kOe and the saturation magnetization (Ms) is 16 emu/g when Mn55Bi45 powders milled about 10 h by SALEBM. Coercivity has achieved a maximum value of 18.2 kOe at room temperature, and 23.5 kOe at 380 K after 14 h of LEBM. Furthermore, Mn55Bi45 powders obtained by LEBM have better magnetic properties.

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“…Nowadays, the demand for rare earth products is increasing in contrast to their available amount resulting in the rare earth crisis. In addition, the rare-earth-based magnet has disadvantages such as poor magnetic performance at high temperatures, poor corrosion resistance, and low curie temperature [1,2]. Thus, the demand for rare-earth-free permanent magnets has attracted many research groups.…”

Section: Introductionmentioning

confidence: 99%

Effect of Mn grinding time on structural, chemical, and magnetic properties of the Manganese Bismuth prepared by sintering in vacuum

Ngamsomrit

Eknapakul

Pinitsoontorn

et al. 2023

J. Phys.: Conf. Ser.

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This work reports the changes in structural, chemical, and magnetic properties of the low-temperature phase manganese bismuth (LTP-MnBi) sintered from mixtures of Bi and Mn ball-milled for different times. The milling time was varied from 1 to 15 hr to produce Mn powder with different particle sizes. The average particle size reduced from ~400 µm (original size) to 35 ± 5 µm and 6 ± 2 µm after 1 and 15 hr milling times, respectively. The LTP-MnBi powder was sintered at 275 °C at vacuum pressure below 5 × 10−7 mbar for 12 hours. By increasing the Mn grinding time, the maximum energy product ((BH)max) of LTP-MnBi decreased from 1.98 ± 0.05 to 1.59 ± 0.07 MGOe, and the saturation magnetization (M s) decreased from 53.42 ± 0.90 to 44.32 ± 0.72 emu/g. The x-ray diffraction patterns indicated the reduction of LTP-MnBi content as a function of the milling time, which is agreed with the decrease in the M s value. This is supported by the x-ray photoelectron results, which also showed the increment of Mn oxides on the surface as a function of Mn milling time. The unexpected decrease in M s, which results in a significant reduction of magnetic performance, might be due to the presence of the oxides preventing diffusion during sintering.

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Preparation and magnetic properties of anisotropic MnBi powders

Cited by 19 publications

References 37 publications

Effects of compression on magnetic properties of MnBi prepared by liquid-phase sintering

Effects of compression on magnetic properties of MnBi prepared by liquid-phase sintering

Microstructure and Magnetic Properties of Mn55Bi45 Powders Obtained by Different Ball Milling Processes

Effect of Mn grinding time on structural, chemical, and magnetic properties of the Manganese Bismuth prepared by sintering in vacuum

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