Solution processed MnBi-FeCo magnetic nanocomposites

Dai, Qilin; Warsi, Muhammad Asif; Xiao, John Q.; Ren, Shenqiang

doi:10.1007/s12274-016-1200-0

Cited by 17 publications

(5 citation statements)

References 20 publications

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“…Numerous methods have been used to synthesize nanocrystalline shape memory alloys (NSMAs), including ionmilling deposition [8], melt-spinning [9], high-pressure torsion [10], and sol-gel technique [11]. Meanwhile, physical techniques for producing NiTi intermetallic compound using elemental Ni and Ti powders [12] have been reported such as conventional powder metallurgy [13], self-propagating high temperature synthesis [14], explosive shock-wave compression [15], and mechanical alloying (MA) [16].…”

Section: Introductionmentioning

confidence: 99%

Influence of Milling Time on Structural and Microstructural Parameters of Ni₅₀Ti₅₀ Prepared by Mechanical Alloying Using Rietveld Analysis

Sakher

Loudjani

Benchiheub

et al. 2018

Journal of Nanomaterials

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Nanostructured Ni 50 Ti 50 powders were prepared by mechanical alloying from elemental Ni and Ti micrometer-sized powders, using a planetary ball mill type Fritsch Pulverisette 7. In this study, the effect of milling time on the evolution of structural and microstructural parameters is investigated. Through Rietveld refinements of X-ray diffraction patterns, phase composition and structural/microstructural parameters such as lattice parameters, average crystallite size ⟨ ⟩, microstrain ⟨ 2 ⟩ 1/2 , and stacking faults probability (SFP) in the frame of MAUD software have been obtained. For prolonged milling time, a mixture of amorphous phase, NiTi-martensite (B19 ), and NiTi-austenite (B2) phases, in addition to FCC-Ni(Ti) and HCP-Ti(Ni) solid solutions, is formed. The crystallite size decreases to the nanometer scale while the internal strain increases. It is observed that, for longer milling time, plastic deformations introduce a large amount of stacking faults in HCP-Ti(Ni) rather than in FCC-Ni(Ti), which are mainly responsible for the observed large amount of the amorphous phase.

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Section: Introductionmentioning

confidence: 99%

Influence of Milling Time on Structural and Microstructural Parameters of Ni₅₀Ti₅₀ Prepared by Mechanical Alloying Using Rietveld Analysis

Sakher

Loudjani

Benchiheub

et al. 2018

Journal of Nanomaterials

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“…However, although these rare‐earth‐free magnets have large coercivities, they show relatively low magnetic moments, which limits their use as high‐performance magnets. Preliminary studies indicate that it is possible to improve their magnetic performance by coupling them to high moment magnetic structures, and the resulting exchange‐coupled nanocomposites evolve as promising candidates to substitute REM‐ and Pt‐based permanent magnets owing to their comparable ( BH ) max . From this perspective, more efforts should be made to control the size, shape, and phase purity of these MNPs.…”

Section: Discussionmentioning

confidence: 99%

Chemical Synthesis of Magnetic Nanoparticles for Permanent Magnet Applications

Shen

Sun

2019

Chemistry A European J

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Permanentm agnets are ac lass of critical materials for information storage, energy storage, and other magnetoelectronic applications. Compared with conventional bulk magnets, magnetic nanoparticles (MNPs) showu nique sizedependentm agnetic properties, which make it possible to control and optimize their magnetic performance for specific applications. The synthesis of MNPs has been intensively explored in recent years. Among different methods developed thus far,c hemical synthesis based on solution-phase reactions has attracted much attention owing to its potential to achievet he desired size, morphology,s tructure, and magnetic controls. This Minireview focuses on the recent chemical syntheses of strongly ferromagnetic MNPs (H c > 10 kOe) of rare-earth metals and FePt intermetallic alloys. It further discusses the potential of enhancing the magnetic performance of MNP composites by assembly of hard and soft MNPs into exchange-coupled nanocomposites.H igh-performance nanocomposites are key to fabricating superstrong permanent magnets form agnetic, electronic, and energy applications.[a] Dr.

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“…In view of their potential application as permanent magnets and to minimize the low coercivity problem, they have been used as a secondary phase in composite systems together with harder magnetic materials, with reports mainly focused on MnBi as the host phase. − Again, promising results have been achieved in these systems, showing the potential of magnetic nanowires as building blocks for permanent magnets. However, the production yield of these nanostructures is usually low and the associated fabrication costs are high, which explains their absence in commercial products nowadays.…”

Section: Introductionmentioning

confidence: 99%

FeCo Nanowire–Strontium Ferrite Powder Composites for Permanent Magnets with High-Energy Products

Guzmán-Mínguez

Ruiz-Gómez

Vicente-Arche

et al. 2020

ACS Appl. Nano Mater.

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Due to the issues associated with rare-earth elements, there arises a strong need for magnets with properties between those of ferrites and rare-earth magnets that could substitute the latter in selected applications. Here, we produce a high remanent magnetization composite bonded magnet by mixing FeCo nanowire powders with hexaferrite particles. In the first step, metallic nanowires with diameters between 30 and 100 nm and length of at least 2 μm are fabricated by electrodeposition. The oriented as-synthesized nanowires show remanence ratios above 0.76 and coercivities above 199 kA/m and resist core oxidation up to 300 °C due to the existence of a >8 nm thin oxide passivating shell. In the second step, a composite powder is fabricated by mixing the nanowires with hexaferrite particles. After the optimal nanowire diameter and composite composition are selected, a bonded magnet is produced. The resulting magnet presents a 20% increase in remanence and an enhancement of the energy product of 48% with respect to a pure hexaferrite (strontium ferrite) magnet. These results put nanowire–ferrite composites at the forefront as candidate materials for alternative magnets for substitution of rare earths in applications that operate with moderate magnet performance.

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Solution processed MnBi-FeCo magnetic nanocomposites

Cited by 17 publications

References 20 publications

Influence of Milling Time on Structural and Microstructural Parameters of Ni₅₀Ti₅₀ Prepared by Mechanical Alloying Using Rietveld Analysis

Influence of Milling Time on Structural and Microstructural Parameters of Ni₅₀Ti₅₀ Prepared by Mechanical Alloying Using Rietveld Analysis

Chemical Synthesis of Magnetic Nanoparticles for Permanent Magnet Applications

FeCo Nanowire–Strontium Ferrite Powder Composites for Permanent Magnets with High-Energy Products

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Solution processed MnBi-FeCo magnetic nanocomposites

Cited by 17 publications

References 20 publications

Influence of Milling Time on Structural and Microstructural Parameters of Ni50Ti50 Prepared by Mechanical Alloying Using Rietveld Analysis

Influence of Milling Time on Structural and Microstructural Parameters of Ni50Ti50 Prepared by Mechanical Alloying Using Rietveld Analysis

Chemical Synthesis of Magnetic Nanoparticles for Permanent Magnet Applications

FeCo Nanowire–Strontium Ferrite Powder Composites for Permanent Magnets with High-Energy Products

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Product

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Influence of Milling Time on Structural and Microstructural Parameters of Ni₅₀Ti₅₀ Prepared by Mechanical Alloying Using Rietveld Analysis

Influence of Milling Time on Structural and Microstructural Parameters of Ni₅₀Ti₅₀ Prepared by Mechanical Alloying Using Rietveld Analysis