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...

Full description

Saved in:
Bibliographic Details
Published in:Physica Status Solidi (b) 2006-05, Vol.243 (6), p.1390-1399
Main Authors: Medina, M. H., Alcázar, G. A. Pérez
Format: Article
Language:English
Subjects:
61.66.Dk
75.30.Kz
75.50.Bb
75.50.Lk
76.80.+y
81.07.Bc
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.)
Magnetic properties and materials
Magnetic resonances and relaxations in condensed matter, mössbauer effect
Magnetically ordered materials: other intrinsic properties
Materials science
Materials synthesis
materials processing
Mössbauer effect
other γ-ray spectroscopy
Physics
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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)
ISSN:0370-1972
1521-3951
DOI:10.1002/pssb.200541342