Coercivity enhancement and magnetization process in Mn55Bi45 alloys with refined particle size

Xiang, Zhen; Song, Yiming; Dong, Pan; Shen, Yue; Qian, Liwei; Luo, Zhengyi; Liu, Yongsheng; Yang, Huawei; Yan, Hai; Lü, Wei

doi:10.1016/j.jallcom.2018.02.102

Cited by 35 publications

(15 citation statements)

References 36 publications

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“…The dependence i H c (D) was studied experimentally in [17][18][19][20], the results affirmed the above said tendency. By increasing the ball-milling times t m , the i H c of milled powders first increases, reaching a plateau and slightly drops when the grain size becomes smaller the domain size of ∼ 0.25 µm (see the inset of Fig.…”

Section: Critical Diamsupporting

confidence: 65%

“…5). The direct dependence between i H c and the grain sizes D was reported in [19] and is reloaded in It is very important to note that, the i H c (D) dependence of non-compacted powders is far from the i H c (D) of compacted, aligned grains and sintered bulk magnets. Depending on the alignment technique, on the compaction and the sintering conditions, the coercivity i H c of bulk sintered magnets is less than that of the green powders.…”

Section: Critical Diammentioning

confidence: 88%

“…The inset shows experimental [8] and calculated data [9] of M s (T ). The dashed line is the Ms abrupt at T c = 633 K [19].…”

Section: Ii1 Magnetizationmentioning

confidence: 99%

“…The i H c (in kOe) vs D (in nm) adopted from[19] and ball-milling times (see the inset[20]). The binary phase diagram of Mn-Bi system adopted from Ref [21]…”

mentioning

confidence: 99%

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MnBi Magnetic Material: A Critical Review

Vuong

2019

Comm. in Phys.

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Manganese Bismuth (MnBi) - the ferromagnetic material attracting a great interest of the world magnetic society last years. The absence of rare-earth elements in compositions, the sizable magnetocrystalline anisotropy, the room-temperature moderate but high-temperature reasonable magnetization plus the positive temperature coefficient of coercivity and the moderate Curie temperature make MnBi bulk magnets very potential for high-temperature magnet application. This bright future is a little gray because the research results in the past were not as expected. The paper summarizes the results concerning the MnBi alloys, powders and bulk magnets investigated during past 67 years. The look on the difficulties inhibiting the development of this material is given and the proposals that might allow overcoming the difficulties and push again the efforts of research towards the goal of 12 MGOe for the energy product (BH)max of MnBi bulk magnets are discussed.

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Section: Critical Diamsupporting

confidence: 65%

Section: Critical Diammentioning

confidence: 88%

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MnBi Magnetic Material: A Critical Review

Vuong

2019

Comm. in Phys.

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“…Low-temperature phase (LTP) MnBi has been considered as a promising rare-earth-free magnet with unique magnetic properties [7][8][9][10]. However, it is difficult to obtain a single phase of LTP MnBi alloy, as Mn tends to segregate from the liquid phase below the peritectic temperature of 719 K [11,12].…”

Section: Introductionmentioning

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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