Facile method of raising the LTP content in Mn-Bi alloys by using sequential separation techniques for Bi and Mn

Roman, Tiberiu; Murgulescu, Iulian-Ioan; Ababei, G.; Stoian, George; Lostun, M.; Porcescu, Marieta; Grigoraş, M.; Lupu, Nicoleta

doi:10.1016/j.mtcomm.2022.104241

Cited by 3 publications

(3 citation statements)

References 17 publications

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“…[24] Furthermore, manganese-based permanent magnets are attractive as a cost-effective and environmentally friendly alternative to rare-earth-based magnets. [25][26][27] The manganese-carbon system poses several practical challenges, particularly concerning the isolation and study of its compounds. Although there is a consensus that a number of stoichiometric manganese carbides exist, there remains a high degree of uncertainty with respect to their phase boundaries.…”

Section: Introductionmentioning

confidence: 99%

“…Manganese carbides have recently attracted attention due to their potential magnetic properties, with magnetic ordering having been observed in Mn 23 C 6 below 104 K, [23] and computational studies suggesting that the hypothetical 2D manganese carbides could demonstrate the high‐temperature ferromagnetism and half‐metallicity crucial for spintronic nanodevices [24] . Furthermore, manganese‐based permanent magnets are attractive as a cost‐effective and environmentally friendly alternative to rare‐earth‐based magnets [25–27] …”

Section: Introductionmentioning

confidence: 99%

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High‐Pressure Synthesis and Recovery of Single Crystals of the Metastable Manganese Carbide, MnC_x

Marshall,

Thiel,

Cote

et al. 2024

Chemistry A European J

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Transition metal carbides find widespread use throughout industry due to their high strength and resilience under extreme conditions. However, they remain largely limited to compounds formed from the early d‐block elements, since the mid‐to‐late transition metals do not form thermodynamically stable carbides. We report here the high‐pressure bulk synthesis of large single crystals of a novel metastable manganese carbide compound,MnCxP63/mmc, which adopts the anti‐NiAs‐type structure with significant substoichiometry at the carbon sites. We demonstrate how synthesis pressure modulates the carbon loading, with~40% occupancy being achieved at 9.9 GPa.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High‐Pressure Synthesis and Recovery of Single Crystals of the Metastable Manganese Carbide, MnC_x

Marshall,

Thiel,

Cote

et al. 2024

Chemistry A European J

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“…Thus, it is expected that the next generation of permanent magnets will not contain rare earths, will come from abundant resources, and will have low costs. There are several types of alternative material systems to rare-earth magnets, such as L1 0 -FeNi [3,4], MnBi [5][6][7], and α -Fe 16 N 2 . Among them, the α -Fe 16 N 2 compound with giant saturation magnetization contains widely available, inexpensive, and completely non-polluting elements, making it a promising candidate for rare-earth-free magnets.…”

Section: Introductionmentioning

confidence: 99%

Innovative Method for the Mass Preparation of α″-Fe16N2 Powders via Gas Atomization

Grigoras,

Lostun,

Porcescu

et al. 2023

Crystals

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The iron nitride materials, especially α″-Fe16N2, are considered one of the most promising candidates for future rare-earth-free magnets. However, the mass production of α″-Fe16N2 powders as a raw material for permanent magnets is still challenging. In this work, starting from iron lumps as a raw material, we have managed to prepare the α″-Fe16N2 powders via the gas atomization method, followed by subsequent nitriding in an ammonia–hydrogen gas mixture stream. The particle size was controlled by changing the gas atomization preparation conditions. X-ray diffractograms (XRD) analyses show that the prepared powders are composed of α″-Fe16N2 and α-Fe phases. The α″-Fe16N2 volume ratio increases with decreasing powder size and increasing nitriding time, reaching a maximum of 57% α″-Fe16N2 phase in powders with size below 32 ± 3 μm after 96 h nitridation. The saturation magnetization reaches the value of 237 emu/g and a reasonable coercivity value of 884 Oe. Compared to the saturation magnetization values of α-Fe powders, the α″-Fe16N2 powders prepared through our proposed approach show an increase of up to 10% in saturation and demonstrate the possibility of mass production of α″-Fe16N2 powders as precursors of permanent magnets without rare earths.

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A core–shell magnet Mn₇₀Bi₃₀ grown at seeds in magnetic fields and its impacts on its spin-dynamics, Curie point and other tailored properties

2023

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The MnBi alloys is a model series of rare-earth free magnets for surge of technologies of small parts of automobiles, power generators, medical tools, memory systems, and many others. The magnetics stem primarily at unpaired Mn-3d5 spins (a 4.23 B moment) align parallel via an orbital moment 0.27 B of Bi-5d106s2p3 in a crystal lattice. Thus, using a surplus Mn (over Bi) in a Mn70Bi30 type alloy designs a spin-rich system of duly tailored properties useful for magnetics and other devices. In this view, we report here a strategy of a refined alloy powder Mn70Bi30 can grow into small crystals of hexagonal (h) plates at seeds as annealed in magnetic fields (in H2 gas). So, small h-plates (30 to 50 nm widths) are grown up at (002) facets, wherein the edges are turned down in a spiral ( 2.1 nm thicknesses) in a core-shell structure. The results are described with X-ray diffraction, lattice images and magnetic properties of a powder Mn70Bi30 (milled in glycine) is annealed at 573 K for different time periods, so to the Mn/Bi order at the permeable facets (seeds). Duly annealed samples exhibit an enhanced magnetization, Ms  70.8 emu/g, with duly promoted coercivity Hc  10.810 kOe (15.910 kOe at 350 K), energy–product 14.8 MGOe, and the crystal-field-anisotropy, K1  7.6x107 erg/cm3, reported at room temperature. Otherwise, Ms should decline at any surplus 3d5-Mn spins order antiparallel at the antisites. Enhanced Curie point 658.1 K (628 K at Mn50Bi50 alloy) anticipates that a surplus Mn does favor the Mn-Bi exchange interactions. Proposed spin models well describe the spin-dynamics and lattice relaxations (on anneals) over the lattice volume (with twins) and spin clusters.

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Facile method of raising the LTP content in Mn-Bi alloys by using sequential separation techniques for Bi and Mn

Cited by 3 publications

References 17 publications

High‐Pressure Synthesis and Recovery of Single Crystals of the Metastable Manganese Carbide, MnC_x

High‐Pressure Synthesis and Recovery of Single Crystals of the Metastable Manganese Carbide, MnC_x

Innovative Method for the Mass Preparation of α″-Fe16N2 Powders via Gas Atomization

A core–shell magnet Mn₇₀Bi₃₀ grown at seeds in magnetic fields and its impacts on its spin-dynamics, Curie point and other tailored properties

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Facile method of raising the LTP content in Mn-Bi alloys by using sequential separation techniques for Bi and Mn

Cited by 3 publications

References 17 publications

High‐Pressure Synthesis and Recovery of Single Crystals of the Metastable Manganese Carbide, MnCx

High‐Pressure Synthesis and Recovery of Single Crystals of the Metastable Manganese Carbide, MnCx

Innovative Method for the Mass Preparation of α″-Fe16N2 Powders via Gas Atomization

A core–shell magnet Mn70Bi30 grown at seeds in magnetic fields and its impacts on its spin-dynamics, Curie point and other tailored properties

Contact Info

Product

Resources

About

High‐Pressure Synthesis and Recovery of Single Crystals of the Metastable Manganese Carbide, MnC_x

High‐Pressure Synthesis and Recovery of Single Crystals of the Metastable Manganese Carbide, MnC_x

A core–shell magnet Mn₇₀Bi₃₀ grown at seeds in magnetic fields and its impacts on its spin-dynamics, Curie point and other tailored properties