The fcc/bcc phase transition in FexNi100−x nanoparticles resolved by first-order reversal curves

Mokarian, Mohammad Hossein; Almasi-Kashi, Mohammad; Alikhanzadeh-Arani, Sima; Ramazani, A.

doi:10.1007/s10853-017-1025-6

Cited by 15 publications

(14 citation statements)

References 30 publications

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“…The saturation magnetizations M S measured for the Fe 0.75 Ni 0.25 and Fe 0.25 Ni 0.75 samples equal 86 and 10 A m 2 /kg, respectively. These values agree more or less with the results obtained for the Fe-Ni nanoparticles synthesised by Mokarian et al [9]. The lower M S obtained for the Fe 0.25 Ni 0.75 chains could be explained considering the higher content of Ni atoms in this sample which, indeed, reveal lower magnetic moment than Fe atoms.…”

Section: Resultssupporting

confidence: 91%

Towards Magnetic Bimetallic Wire-Like Nanostructures — Magnetic Field as Growth Parameter

et al. 2020

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The magnetically-assisted growth of the amorphous bimetallic iron-nickel wire-like nanostructures is presented in this work. The applied process is based on a simple reduction reaction of aqueous solutions containing Fe 2+ and Ni 2+ ions with NaBH4 in the presence of an external magnetic field of about 0.05 T. The morphology, chemical composition, and magnetic properties of as-prepared Fe-Ni nanostructures have been determined by means of scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffractometry, and vibrating sample magnetometry. The obtained experimental data indicate that the as-prepared samples exhibit quite complex architectures i.e., they comprise of nanoparticles aligned in almost straight lines. In addition, they reveal the typical core-shell structures where the amorphous bimetallic alloy cores are covered by thin amorphous oxide shells. In turn, the magnetic measurements show that the Fe-Ni wire-like nanostructures behave as typical ferromagnetic nanomaterials and their magnetic parameters like saturation magnetizations and coercivities are strictly dependent on their sizes and chemical compositions.

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Section: Resultssupporting

confidence: 91%

Towards Magnetic Bimetallic Wire-Like Nanostructures — Magnetic Field as Growth Parameter

et al. 2020

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“…In general, it is found that the M S of as-prepared Fe-Ni chains decreases with an increase in Ni content and this observation can be referred to the fact that Ni atoms possess lower magnetic moment than Fe atoms. [27,44] Moreover, this observation is in agreement with the Slater-Pauling curve. [45] The 400°C results in their oxidation and this causes the formation of NiFe 2 O 4 (56 Am 2 kg À1 [49] ), Fe 3 O 4 (92 Am 2 kg À1 [28] ), and a-Fe 2 O 3 (0.3 Am 2 kg À1 [28] ).…”

Section: Resultssupporting

confidence: 82%

Impact of Thermal Oxidation on Morphological, Structural and Magnetic Properties of Fe-Ni Wire-Like Nanochains

Krajewski

Tokarczyk

Lewińska

et al. 2021

Metall Mater Trans A

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This work presents the evolution of morphological, structural and magnetic properties of amorphous Fe-Ni wire-like nanochains caused by thermal oxidation. The initial Fe1−xNix samples (x = 0.75; 0.50; 0.25) were prepared through the magnetic-field-induced synthesis, and then they were heated in dry air at 400 °C and 500 °C. These treatments led to two competing simultaneous processes occurring in the investigated samples, i.e., (i) a conversion of amorphous material into crystalline material, and (ii) their oxidation. Both of them strictly affected the morphological and structural properties of the Fe-Ni nanochains which, in turn, were associated with the amount of iron in material. It was found that the Fe0.75Ni0.25 and Fe0.50Ni0.50 nanochains were covered during thermal treatment by the nanoparticle oxides. This coverage did not constitute a good barrier against oxidation, and these samples became more oxidized than the Fe0.25Ni0.75 sample which was covered by oxide nanosheets and contained additional Ni3B phase. The specific morphological evolutions of the Fe-Ni nanochains also influenced their saturation magnetizations, whereas their coercivities did not vary significantly. The obtained results constitute an important source of information for future application of the thermally treated Fe-Ni nanochains which could be applied in the energy storage devices or catalysis.

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“…To reveal the magnetic property and structure information, the magnetization hysteresis loops together with X-ray diffraction (XRD) measurements are investigated on the FeCo nanoparticles at different oxidation stages from solid, core–shell, and hollow nanostructures. The FeCo particles with 9.6 nm show a high saturated magnetization of 124 emu/g and a coercivity of 200 Oe, which is consistent with a previous report at the size of ∼10 nm without thermal annealing (Figure a,b). − The corresponding XRD pattern is shown in Figure c where the sharp diffraction peaks can be assigned to the (110) and (200) reflections of the bcc-FeCo alloy nanoparticles, indicating the crystalline nature of the as-prepared nanoparticles . When the particles are gradually oxidized at the surface, the saturated magnetization of the core–shell structure at ∼1 h oxidation time is decreased to ∼100 emu/g while the coercive field is slightly increased to 310 Oe (Figure b).…”

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confidence: 89%

“…25−28 The corresponding XRD pattern is shown in Figure 3c where the sharp diffraction peaks can be assigned to the (110) and ( 200) reflections of the bcc-FeCo alloy nanoparticles, indicating the crystalline nature of the asprepared nanoparticles. 29 When the particles are gradually oxidized at the surface, the saturated magnetization of the core−shell structure at ∼1 h oxidation time is decreased to ∼100 emu/g while the coercive field is slightly increased to 310 Oe (Figure 3b). The intensity of the FeCo peak is decreased in the XRD pattern.…”

Section: Acs Applied Nano Materialsmentioning

confidence: 77%

Structure and Magnetism Evolution from FeCo Nanoparticles to Hollow Nanostructure Conversion for Magnetic Applications

Zhang

Thenuwara

et al. 2018

ACS Appl. Nano Mater.

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Hollow nanostructures have witnessed an increasing interest in emerging fields, including energy storage electrodes, nanocatalysis, photonics, and biomedical carriers. The fundamental mechanisms for hollowing conversion chemistry of complex nanoalloys are indispensable to grow such nanostructures with controlled compositions and functionalities. Here, we study the Kirkendall effect on magnetic Fe−Co bimetallic alloys with the formation of hollow nanostructures for exchange interactions. The rich diffusion kinetics of binary Fe−Co alloys accompanied by its conversion from solid, core− shell to hollow nanostructures have been captured through X-ray diffraction pattern and electron microscopy. We further report the cation exchange improved magnetic performance of hollow nanostructures by increasing the crystallinity.

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The fcc/bcc phase transition in FexNi100−x nanoparticles resolved by first-order reversal curves

Cited by 15 publications

References 30 publications

Towards Magnetic Bimetallic Wire-Like Nanostructures — Magnetic Field as Growth Parameter

Towards Magnetic Bimetallic Wire-Like Nanostructures — Magnetic Field as Growth Parameter

Impact of Thermal Oxidation on Morphological, Structural and Magnetic Properties of Fe-Ni Wire-Like Nanochains

Structure and Magnetism Evolution from FeCo Nanoparticles to Hollow Nanostructure Conversion for Magnetic Applications

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