期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 674, 期 -, 页码 153-161出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2016.03.068
关键词
Nanoparticles; Disordered alloys; Hyperfine interactions; Mossbauer spectroscopy
资金
- Hungarian National Research, Development and Innovation Office - NKFIH [1015784, K115913]
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior [A127/2013]
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), Fe-57 Mossbauer 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 approximate to 53% and x approximate to 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 Fe-57 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. (C) 2016 Elsevier B.V. All rights reserved.
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