Thermodynamic Assessment of the Bi-Mn System

Oikawa, Katsunari; Mitsui, Yoshifuru; Koyama, K.; Anzai, Koichi

doi:10.2320/matertrans.m2011229

Cited by 33 publications

(18 citation statements)

References 37 publications

(61 reference statements)

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“…and the calculated diagram by Oikawa et al 20) Considering the phase diagram of the BiMn system that was reported by Chen,11) the single composition lines of BiMn and BiMn 1.08 were used to represent the LTP and the HTP, respectively. T E and T p1 were observed even at the Mn-rich composition.…”

Section: )mentioning

confidence: 99%

Bi–Mn Binary Phase Diagram in High Magnetic Fields

2013

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To examine magnetic field effects on the BiMn equilibrium phase, a high-magnetic fields differential thermal analysis (HF-DTA) was performed for fields up to 18 T and temperatures ranging from 300 to 753 K. For zero field, the peritectic temperatures T p1 (BiMn 1.08 + Bi-rich liquid ¼ BiMn) and T p2 (¡Mn + Bi-rich liquid ¼ BiMn 1.08 ), and the eutectic temperature T E (the Bi-rich liquid ¼ Bi solid + BiMn) were determined to be 632, 721 and 538 K, respectively. The BiMn phase diagram at 18 T was obtained, which showed that T p1 increases with increasing magnetic fields at the rate of 2 K T ¹1. Furthermore, the liquidus boundary temperature T liq between BiMn 1.08 + liquid and Bi-rich liquid was found to increase nonlinearly with increasing magnetic field.

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Section: )mentioning

confidence: 99%

Bi–Mn Binary Phase Diagram in High Magnetic Fields

2013

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“…The experimental obtained results show that the most efficient annealing temperature Ta is 300 o C and the annealing time ta is 20 h. At the temperature lower 300 o C the mobility of Bismuth atoms is weaker and drops to zero for 271 o C where the Bismuth is solidified. At the temperature higher 300 o C, although the mobility of Bismuth atoms is high, however, according to the phase diagram [8], the phase formed at this high temperature is preferred to be paramagnetic of Mn1.08Bi. The saturation annealing time of 20 h is experimental value showing the mechanism of LTP formation during the isothermal annealing process is diffusive as described in Ref.…”

Section: Pmentioning

confidence: 99%

On the Balance between Magnetization and Coercivity of MnBi Green Powders and Magnets Prepared Thereof

Xuan¹,

Vu²,

Nguyen³

2021

MaP

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Currently, MnBi magnetic material is promising to be very potential for low-cost high-temperature permanent magnetic applications. The most attractive parameters are the high magnetocrystalline anisotropy energy and its positive thermal coefficient which allow a high coercivity of MnBi magnets working even at 150 – 200 oC. This advantage is paid by the moderate value of magnetization, so the high energy product of MnBi magnets depends on how one can keep a good balance between the remanent magnetization Mr and the coercivity bHc. The paper considers this problem and discusses how to regulate the processing route to keep this balance to enhance the performance of MnBi green powders and MnBi bulk magnets prepared thereof

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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]. Yang et al [7] studied that Mn segregation can be reduced by melt-spinning process, in addition Mn 55 Bi 45 can promote the formation of high purity LTP MnBi alloy.…”

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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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Thermodynamic Assessment of the Bi-Mn System

Cited by 33 publications

References 37 publications

Bi–Mn Binary Phase Diagram in High Magnetic Fields

Bi–Mn Binary Phase Diagram in High Magnetic Fields

On the Balance between Magnetization and Coercivity of MnBi Green Powders and Magnets Prepared Thereof

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

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Thermodynamic Assessment of the Bi-Mn System

Cited by 33 publications

References 37 publications

Bi&ndash;Mn Binary Phase Diagram in High Magnetic Fields

Bi&ndash;Mn Binary Phase Diagram in High Magnetic Fields

On the Balance between Magnetization and Coercivity of MnBi Green Powders and Magnets Prepared Thereof

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

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Bi–Mn Binary Phase Diagram in High Magnetic Fields

Bi–Mn Binary Phase Diagram in High Magnetic Fields