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Article Dans Une Revue Journal of Superconductivity and Novel Magnetism Année : 2023

Thermal Stability, Structure, Hyperfine, and Magnetic Properties of Nanostructured FeCo-2.5wt.%Ni Powders

Résumé

Structure, hyperfine, thermal stability, and magnetic properties of the mechanically alloyed Fe47.5Co50Ni2.5 (Fe47.5) and Fe50Co47.5Ni2.5 (Fe50) powders were investigated by using X-ray diffraction (XRD), 57Fe Mössbauer spectrometry, differential scanning calorimetry, and vibrating sample magnetometer, respectively. The XRD results show the existence of bcc α-Fe type, bcc FeCo, and hcp Co-type structures. 57Fe Mössbauer spectrometry confirms the formation of Fe- and Co-rich environments. The average hyperfine magnetic field and the saturation magnetization exhibit different behaviors up to 24 h but a similar trend after 48 h of milling for both samples. The variation of the coercivity is different up to 12 h of milling but identical after 24 h of milling for both samples. The addition of 2.5wt.%Ni lowers the disordered-to-ordered (Tα→α′) and α → γ (Tα→γ) phase transformation temperatures. The structure of ball-milled and heat-treated samples consists of bcc α-Fe type (a = 0.2864–0.2874 nm) and FeCo (a = 0.2853–0.2858 nm) phases with crystallite sizes of approximately 39–54 nm. The saturation magnetization increases to about 201–220 emu/g, and the coercivity decreases to approximately 35–57 Oe after thermal annealing. According to the squareness Mr/Ms ratio, the as-milled and heat-treated powders are multidomain.
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Dates et versions

hal-04095857 , version 1 (12-05-2023)

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M. Beldjehem, S. Alleg, N. Bensebaa, J. J. Suñol, J. M. Greneche. Thermal Stability, Structure, Hyperfine, and Magnetic Properties of Nanostructured FeCo-2.5wt.%Ni Powders. Journal of Superconductivity and Novel Magnetism, 2023, 36, pp.301-314. ⟨10.1007/s10948-022-06467-3⟩. ⟨hal-04095857⟩
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