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Effect of Milling Time and Composition on the Magnetic and Structural Properties of the System Fe x Mn 0.95–x Al 0.05 (0.40 ≤ x ≤ 0.50)
Author(s) -
Rodríguez R.,
Pérez Alcázar G.A.
Publication year - 2000
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/1521-3951(200007)220:1<441::aid-pssb441>3.0.co;2-4
Subject(s) - hyperfine structure , lattice constant , alloy , materials science , mössbauer spectroscopy , grain size , analytical chemistry (journal) , diffraction , spectral line , crystallography , metallurgy , chemistry , atomic physics , physics , chromatography , optics , astronomy
The magnetic and structural properties of the Fe x Mn 0.95– x Al 0.05 (0.40 ≤ x ≤ 0.50) alloy system prepared by mechanical alloying during 12, 24, 36 and 48 hours, were studied by Mössbauer spectroscopy and X‐ray diffraction. By X‐ray it was proved that the lattice parameter is nearly constant (≈3.64 Å) with the milling time and composition. All the diffractograms exhibit the f.c.c. phase characteristic peaks, except for the 12 hours milling samples which present additional Fe, Mn and Al peaks. Then for this time the alloys were not consolidated. Also, it was proved that the mean grain size increases between 12 and 24 hours milling and then decreases for 36 and 48 hours. This decrease is attributed to the breaking of the grains. The Mössbauer spectra of the 12 hours milling samples were fitted with a hyperfine field distribution and a sextet, corresponding to the f.c.c. alloy and the Fe, respectively. From the fits of the spectra it was obtained that the mean hyperfine field decreases from 2.7 to 2.2 T when the Fe content increases from 40 to 50% for the 12 hours milling samples and it remains nearly constant with the Fe content (≈2.9 T) for 24, 36 and 48 hours milling samples.