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- Title
MAGNETIC AND STRUCTURAL CHARACTERIZATION OF MECHANICALLY ALLOYED Fe<sub>50</sub>Co<sub>50</sub> SAMPLES.
- Authors
Alcázar, Germán A. Pérez; Zamora, Ligia Edith; Marco, José Francisco; Romero, Juan José; González, Jesús María; Palomares, Francisco Javier
- Abstract
Samples of nominal composition Fe50Co50 were produced by mechanical alloying by using a planetary ball mill and different milling times. The samples were studied via X-ray diffraction, Mössbauer spectroscopy, and X-ray photoelectron spectroscopy to characterize the phase distribution resulting from the milling process. The Mössbauer data indicated that Co starts diffusing into Fe after 8 h of milling. Between t = 8h and t = 24 h the sample has a heterogeneous composition, presenting a bimodal hyperfine field distribution with maxima centred at 34.3 T and 35.8 - 36.4 T, compatible with the presence of different Fe environments (richer in Co and richer in Fe, respectively). After 48 h of milling, the sample presents a more homogeneous composition showing an almost symmetric hyperfine magnetic field distribution centred at H=34.9 T, indicating that a disordered equiatomic FeCo solid solution has already been formed. The X-ray photoelectron spectroscopy data indicate that the native oxide layer formed on the freshly milled samples contains Co2+, Fe2+ and Fe3+ oxides. After complete removal of this native oxide layer by Ar ion bombardment, X-ray photoelectron spectroscopy analysis yields the composition of the nominal equiatomic Fe50Co50 alloy.
- Subjects
MAGNETIC properties of iron compounds; COBALT compounds; MAGNETIC properties of transition metal compounds; MAGNETIC structure; MECHANICAL alloying; X-ray diffraction; X-ray photoelectron spectroscopy
- Publication
Revista de Ciencias, 2011, Vol 15, p41
- ISSN
0121-1935
- Publication type
Article