Mössbauer Spectroscopy Analysis of FeCo Nano-Particles Alloy Synthesized by Hydrothermal Method

Abstract:

Mössbauer spectroscopy (MS), was used to characterize the synthesized materials prepared from the elemental powders by hydrothermal method which are binary iron-based nanoparticles (NPs) Fe₁₅Co₈₅ and Fe₁₀Co₉₀ alloys. The transmission ⁵⁷Fe Mössbauer spectra were measured at room temperature RT (T~300K), using ⁵⁷Co γ-ray source with an Activity ~ 1.85 GBq (50 mCi). The analysis of Mössbauer spectra curves was by using WinNormos with two subspectra with the “Site” option and then with the “Dist” option in order to learn more about hyperfine interactions and parameters such as isomer shifts IS, quadruple splitting QS and hyperfine magnetic field B_hf. MS results observe only one Zeeman sextet with a relative area of ~77.125% with parameter B_hf = 32.727 T and line width Γ=0.693 mm/s for Fe₁₀Co₉₀, and a relative area of ~84.719% with parameter B_hf = 34.354 T and line width Γ=1.043 mm/s for Fe₁₅Co₈₅ and one broad singlet which confirms the body-centered cubic structure BCC. The main contribution to the spectra comes from the magnetic sextet which is assigned to ferromagnetic FeCo phase which is the dominant one while the singlet is assigned to paramagnetic phase. As a result of the analysis of the distributions hyperfine magnetic field the average values of the hyperfine parameters of the Mössbauer spectra were obtained <B_hf>Fe₁₀Co₉₀ = 28.3363 T and <B_hf>Fe₁₅Co₈₅ = 31.4657 T. Therefore, it is observed that the increasing of the cobalt concentration decreases the hyperfine field. The results observe indicates Co concentration dependence, where for Co-rich alloys (Fe₁₀Co₉₀) the FCC (face-centered cubic structure) contributing to the decrease in B_hf due to the absence of BCC. the obtained NPs most likely to be in disordered structure A2.

• Periodical: Materials Science Forum (Volume 1148)
• Pages: 53-58
• DOI: https://doi.org/10.4028/p-YD0e66
• Online since: May 2025
• Authors: Mohamed Walid Halimi*, Abderrahim Guittoum, Messaoud Hemmous, Imen Bouelkreb
• Keywords: FeCo Nanopowder, Hydrothermal Synthesis, Hyperfine Interactions, Magnetic Properties, Mössbauer Spectroscopy

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