Structural and magnetic properties of Fe0.45Mn0.25Al0.30 alloys prepared by mechanical alloying

Samples from the Fe0.45Mn0.25Al0.30 system were prepared by mechanical alloying during 4, 8, 12, 16, 22 and 24 h by using two different powder‐mass‐to‐ball‐mass ratios of: 1:7.5 and 1:4. X‐ray diffraction (XRD) characterization reveled that samples with 1:7.5 ratios consolidate in a ternary Fe–Mn–Al α‐Fe solid solution at 8 h (chemical mixing time) and those with 1:4 ratios after more than 12 h milling. Mössbauer effect studies (MS) in conjunction with XRD studies show, in samples with a 1:7.5 ratio, a paramagnetic site and a hyperfine field distribution (HFD) for 4 h and only a paramagnetic site for 8 h or more. Therefore, the solid solution is paramagnetic in the stable state. Similar results were obtained for 1:4 ratios, but the paramagnetic site was observed after 16 h or more. Mössbauer studies at low temperatures of the sample milled for 12 h and a 1:4 ratio demonstrate that this sample presents a re‐entrant spin‐glass to the ferromagnetic transition (RSG–F) at T k = 45 K. This RSG–F transition was proven by an ac magnetic susceptibility measurement, appearing at T = 30 K. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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