Synthesis, microstructure and magnetic properties of Heusler Co
            <sub>2</sub>
            FeSn nanoparticles

Li, Tao; Duan, Jihong; Yang, Chunkui; Kou, Xiaoming

doi:10.1049/mnl.2012.0905

Cited by 28 publications

(14 citation statements)

References 31 publications

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“…In addition, Fe 2 CoGa nanoparticles were synthesized, while the structure was Li 2 AgSb or Hg 2 CuTi type, the so-called 'inverse Heusler' (Figure 3(f)) [39]. To our knowledge, for other L2 1 -Heusler nanoparticles, the size was not small enough, or there was not sufficient information on the size distribution or no proof of the L2 1 phase, like Co 2 FeSn [40] and Ni 2 MnIn [41].…”

Section: Beyond Our Studiesmentioning

confidence: 99%

The emergence of Heusler alloy catalysts

Kojima

Kameoka

Tsai

2019

Science and Technology of Advanced Materials

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For over a century, Heusler alloys (X 2 YZ; X, Y: transition metals, Z: typical metals) have attracted attention as magnetic materials. Nowadays, they are also popular as thermoelectric and shape memory materials. However, until very recently, Heusler alloys had been almost unknown as catalysts. We conceived that they could be ideal candidates for catalysts because (1) they have so many elemental sets and (2) they can be partially substituted with other elements (e.g. X 2 YZ 1-x Z' x) in many cases. We first investigated a variety of Heusler alloys as catalysts and then discovered effective catalysts without precious metals for the selective hydrogenation of alkynes based on the aforementioned feature (1) and demonstrated a systematic tuning of catalytic properties by applying the feature (2). Heusler alloy catalysts have also recently been studied by other groups; hence, this traditional alloy group is becoming a new stream in terms of catalysis. In this article, we review the current progress on Heusler alloy catalysts and describe their future prospects.

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Section: Beyond Our Studiesmentioning

confidence: 99%

The emergence of Heusler alloy catalysts

Kojima

Kameoka

Tsai

2019

Science and Technology of Advanced Materials

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“…Small amounts of Co 3 Sn 2 were observed to form according to the current densities [12]. Li et al used a reduction method of metal chlorides and sulfate, with sodium hypophosphite as a reducing agent, to prepare nanoparticles of B2 Co 2 FeSn [14]. Finally, L2 1 Co 2 FeSn Heusler alloys films were synthesized by atomically controlled deposition of successive layers of Co, Fe, and Sn for substrate temperatures of at most 523 K [15].…”

Section: Ternary Fe-co-sn Alloys; Heusler and Related Alloysmentioning

confidence: 99%

B2 long-range order in mechanically alloyed Fe53.3−0.6x Co46.7−0.4x Sn x (2 ≤ x ≤ 26) annealed at moderate temperatures

2016

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Recent interest in Fe-Co-Sn alloys stems from Heusler alloys. A Co 2 FeSnHeusler alloy is found to be unstable relative to other phases from ab initio calculations. However, it may be synthesized by non-equilibrium techniques. The present work focuses similarly on metastable ordered phases in ternary Fe-Co-Sn alloys. First, disordered phases of Sn in near-equiatomic Fe-Co are prepared by high-energy ball-milling. As-milled powders are then annealed to possibly produce long-range ordered phases. As-milled powders, of overall composition Fe 53.3-0.6x Co 46.7-0.4x Sn x (2 B x B 34), consist of a single supersaturated bcc phase for x \ *15 at.%. For larger values of x, they are primarily composed of a bcc phase, whose tin content still increases up to *26 at.%, and of extra phases, which include hexagonal (Fe,Co) 3 Sn 2 . Neutron diffraction patterns and 119 Sn Mössbauer spectra prove that bcc phases of as-milled alloys order to CsCl (B2)-type structures for x B 26 when annealed at 673 K. In addition, 119 Sn Mö ssbauer spectra reveal that a Sn content of *15 at.% marks the separation between domains with different short-range orders. From previous and present results, metastable B2 ordering of Sn-rich Co-Fe-Sn alloys is concluded to occur over a significant concentration range. temperatures below *1000 K for x ranging between *40 and *60 [1]. A perfect B2 FeCo alloy may be described as two interpenetrating simple cubic sublattices, in (0,0,0) and in (1/2,1/2,1/2), Fe on one and Co on the other. Ferromagnetism stabilizes the B2

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“…16 In our previous work, Heusler Co 2 FeSn nanoparticles in a B2-type cubic structure have been synthesized by using a solution reduction method. 17 The obtained Heusler Co 2 FeSn nanoparticles were ferromagnetic at room temperature and showed a saturation magnetization (M S ) of 82 emu/g and coercivity (H C ) of 40 Oe. Recently, amorphous Sn-Co-Fe ternary alloys have been obtained by Chisholm et al 18 by using the electrodeposition method with an environmentally friendly electrolyte.…”

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Effect of Current Density on the Microstructure and Magnetic Properties of Electrodeposited Co₂FeSn Heusler Alloy

Duan

Kou

2013

J. Electrochem. Soc.

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Synthesis of Co 2 FeSn Heusler alloy using a simple and low-cost electrodeposition method is reported for the first time. The effect of deposition current density on crystal structure, chemical composition, morphology and magnetic properties of the samples was studied. The electrodeposited Co 2 FeSn alloy showed a nanocrystalline structure. Magnetic measurement reveals that the obtained Co 2 FeSn are soft magnetic at room temperature with the coercivity of 32 Oe. The saturation magnetic moment of the electrodeposited Co 2 FeSn alloy at 5 K is estimated to be 4.5 μ B /f.u. The relationship between the microstructure and magnetic properties of the samples was discussed.The Co 2 YZ (Y = transition metals, Z = main group element) Heusler compounds are of special interest for applications as they exhibit a large saturation magnetization and high value of Curie temperature. They are a remarkable class of magnetic materials that hold the greatest potential to achieve half-metallicity at room temperature and are also ideal for spintronics. 1,2 Up to now, a large number of Co 2 YZ compounds have been synthesized and their structures and physical properties have been investigated. 3 Various methods include magnetron sputtering, 4,5 molecular beam epitaxy, 6 arc melting 7 and ballmilling 8 are commonly used to prepare the Heusler alloys.Recently, there has been a renaissance of the electrochemical deposition method for the synthesis of compositionally modulated alloys, because the electrodeposition process is cheap and is possible for industrial production. 9-11 The advantages of electrodeposition over physical deposition methods are numerous: no need of vacuum equipment, easier handling, higher deposition rates. 12 Moreover, electrodeposition has the potential to yield amorphous and microcrystalline alloys which cannot be obtained from the corresponding thermally produced alloys of the same chemical composition. 13 Regretfully, up to now, there are no studies on the synthesis of Co 2 YZ Heusler alloys using the electrodeposition method.Co 2 FeSn is a cheap Heusler alloy and is predicted to have considerably large magnetic moment according to Slater-Pauling behavior. 14,15 In Co 2 YZ Heusler compounds with the cubic L2 1 ordered structure, Co atoms occupy the Wyckoff position 8c (1/4, 1/4, 1/4), Y and Z atoms are located at 4a (0, 0, 0) and 4b (1/2, 1/2, 1/2), respectively. Depending on site exchangeability, various types of site disorders have been identified: if all atomic sites are equivalent, the Co 2 YZ Heusler alloy will show an A2-type disorder [body-centered cubic (bcc) lattice]; while if only Y and Z atoms are exchangeable, the 4a and 4b positions become equivalent, the Co 2 YZ Heusler alloy will show a B2 ordered structure (simple cubic lattice). 16 In our previous work, Heusler Co 2 FeSn nanoparticles in a B2-type cubic structure have been synthesized by using a solution reduction method. 17 The obtained Heusler Co 2 FeSn nanoparticles were ferromagnetic at room temperature and showed a saturation magnetization (...

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Synthesis, microstructure and magnetic properties of Heusler Co ₂ FeSn nanoparticles

Cited by 28 publications

References 31 publications

The emergence of Heusler alloy catalysts

The emergence of Heusler alloy catalysts

B2 long-range order in mechanically alloyed Fe53.3−0.6x Co46.7−0.4x Sn x (2 ≤ x ≤ 26) annealed at moderate temperatures

Effect of Current Density on the Microstructure and Magnetic Properties of Electrodeposited Co₂FeSn Heusler Alloy

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Synthesis, microstructure and magnetic properties of Heusler Co 2 FeSn nanoparticles

Cited by 28 publications

References 31 publications

The emergence of Heusler alloy catalysts

The emergence of Heusler alloy catalysts

B2 long-range order in mechanically alloyed Fe53.3−0.6x Co46.7−0.4x Sn x (2 ≤ x ≤ 26) annealed at moderate temperatures

Effect of Current Density on the Microstructure and Magnetic Properties of Electrodeposited Co2FeSn Heusler Alloy

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Synthesis, microstructure and magnetic properties of Heusler Co ₂ FeSn nanoparticles

Effect of Current Density on the Microstructure and Magnetic Properties of Electrodeposited Co₂FeSn Heusler Alloy