Structure and magnetism of Fe–Co alloy nanoparticles

We report the hydrothermal synthesis and structure of FexCo1−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...

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Bibliographic Details
Published in:Journal of alloys and compounds 2016-07, Vol.674, p.153-161
Main Authors: Klencsár, Z., Németh, P., Sándor, Z., Horváth, T., Sajó, I.E., Mészáros, S., Mantilla, J., Coaquira, J.A.H., Garg, V.K., Kuzmann, E., Tolnai, Gy
Format: Article
Language:English
Subjects:
Atomic beam spectroscopy
Atomic properties
Atomic structure
Disordered alloys
Heat treatment
Hyperfine interactions
Intermetallic compounds
Iron
Magnetization
Mössbauer spectroscopy
Nanoparticles
Transmission electron microscopy
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Summary:We report the hydrothermal synthesis and structure of FexCo1−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), 57Fe Mössbauer 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 FexCo1−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 57Fe 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. •α-FexCo1−x alloy nanoparticles have been prepared via hydrothermal process.•A disordered alloy atomic structure is revealed by 57Fe Mössbauer spectroscopy.•The effect of alloying on the 57Fe hyperfine interaction parameters is elucidated.•The nanoparticles show considerable stability against oxidation in ambient air.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2016.03.068