Structural properties of Fe50Co50 nanostructured powder prepared by mechanical alloying

Moumeni, H.; Alleg, S.; Grenèche, Jean‐Marc

doi:10.1016/j.jallcom.2004.05.017

Cited by 101 publications

(80 citation statements)

References 24 publications

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“…Various preparation methods, such as mechanical alloying [16], polyol [17,18,19] and solgel [20,21] process, transmetallation [22], coprecipitation [23], as well as co-reduction [24] with ultrasound assistance [25] have been reported to result in Fe-Co alloy nanoparticles with various Co concentration levels. Due to their large reactive specific surface area, fine metal powders can be susceptible to spontaneous ignition under exposure to air, and consequently they require special precautions regarding their storage and manipulations [26].…”

Section: Introductionmentioning

confidence: 99%

Structure and magnetism of Fe–Co alloy nanoparticles

Klencsár

Németh

Zoltán

et al. 2016

Journal of Alloys and Compounds

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We report the hydrothermal synthesis and structure of Fe x Co 1-x alloy nanoparticles with considerable stability against oxidation under ambient atmosphere. Powder X-ray diffractometry (XRD), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDX), inductively coupled plasma mass spectrometry (ICP-MS), 57 FeMössbauer spectroscopy and magnetization measurements are applied to characterize the composition, morphology, crystal structure, atomic order and magnetic properties of the nanoparticles. As-prepared samples are composed mainly of the bcc Fe x Co 1-x alloy phase.TEM images of heat-treated samples confirm the nanoparticle nature of the original alloys. A consistent analysis of the experimental results leads to x  53% and x  62% Fe atomic ratio respectively in two analogous alloy samples, and suggests that the atomic level structure of the nanoparticles corresponds to that of a fully disordered (A2-type) alloy phase. Exploration of the effect of cobalt on the 57 Fe hyperfine parameters of iron microenvironments suggests that in these alloys the electronic state of Fe atoms is perturbed equally and in an additive manner by atoms in their first two coordination spheres.

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Section: Introductionmentioning

confidence: 99%

Structure and magnetism of Fe–Co alloy nanoparticles

Klencsár

Németh

Zoltán

et al. 2016

Journal of Alloys and Compounds

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“…They are typical of disordered Fe 50 Co 50 conventional alloy [8][9][10]. Mean hyperfine field value is lower than those reported for mechanically alloyed Fe 50 Co 50 system [11,12,2,13,14]. Dispersion of HFD is about 3 times larger than in the case of the ordered Fe 50 Co 50 alloy ( [8] -59 Co spin-echo NMR data, 30 days annealed samples).…”

Section: Resultsmentioning

confidence: 91%

“…These properties, significantly dependent on grain size, internal strain and crystal structure, are shown to be superior in the nanostructured alloys, for example Moumeni et al [2,3] reported that after 24 h of high-energy ball milling between elemental Fe and Co the homogeneous bcc Fe 50 Co 50 solid solution was formed due to diffusion of Co into α-Fe. In the present work, the polycrystalline powder samples were prepared by ball milling of Fe 50 Co 50 alloy swarfs.…”

Section: Introductionmentioning

confidence: 99%

Influence of Milling and Compaction Processes οn Magnetic Properties of FeCo Powder

et al. 2009

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Magnetic and structural studies were performed on Fe 50 Co 50 material. The samples (disk-shaped, diameter: 10 mm, thickness: 2.5 mm) were fabricated by compaction of powder under pressure of 800 MPa for 5 min at temperatures 300-600• C. The powder was obtained by milling of Fe 50 Co 50 alloy swarfs in high-energy planetary mill. The milling time varied from 1 h to 40 h. In the course of milling process the mean size of alloy pieces was decreasing from about 0.5 mm to 0.05 mm (scanning electron microscopy), which provided more compact structure after compression. The annealing process during compaction strongly reduces a coercive field of the samples. Parameters of conversion electron Mössbauer spectra are almost the same for all samples, which points to not significant changes of atomic and magnetic order after milling and compacting.

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“…Equilibrium between fracturing and cold welding leads to the homogeneity of the particles at the macroscopic scale as shown in Fig. 2d for the Fe50Co50 powder mixture [37,38]. True alloy with composition similar to the starting constituents is formed at the completion of the mechanical alloying process (Fig.…”

Section: Mechanical Alloying Processmentioning

confidence: 99%

“…Several studies of the alloy formation process during mechanical alloying have led to conflicting conclusions such as the interdiffusion of elements, the interactions on interface boundaries and/or the diffusion of solute atoms in the host matrix. Indeed, Moumeni et al have reported that the FeCo solid solution was formed by the interdiffusion of Fe and Co atoms with a predominance of Co diffusion into the Fe matrix according to the spectrometry results [37]. However, Brüning et al have shown that the FeCo solid solution was formed by the dissolution of Co atoms in the Fe lattice [39].…”

Section: Mechanical Alloying Processmentioning

confidence: 99%