Magnetic and Structural Characterization of Mechanically Alloyed Fe50co50 Samples

• Pérez Alcázar, Germán A. ^[1] ; Zamora, Ligia Edith ^[1] ; Marco, José Francisco ^[3] ; Romero, Juan José ^[4] ; González, Jesús María ^[5] ; Palomares, Francisco Javier ^[2]
  1. [1] Universidad del Valle (Colombia)

     Universidad del Valle (Colombia)

     Colombia

     
  2. [2] Instituto de Ciencia de Materiales de Madrid

     Instituto de Ciencia de Materiales de Madrid

     Madrid, España

     
  3. [3] Instituto de Física-Química Rocasolano, Madrid
  4. [4] Instituto de Magnetismo Aplicado, Madrid
  5. [5] Unidad Asociada ICMM-IMA, Madrid

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• Localización: Revista de Ciencias Universidad del Valle, ISSN-e 2248-4000, ISSN 0121-1935, Nº. 15, 2011, págs. 41-47
• Idioma: español
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• Resumen

  • Samples of nominal composition Fe50Co50 were produced by mechanical alloying byusing a planetary ball mill and different milling times. The samples were studied via X-raydiffraction, Mössbauer spectroscopy, and X-ray photoelectron spectroscopy to characterize thephase distribution resulting from the milling process. The Mössbauer data indicated that Co startsdiffusing into Fe after 8 h of milling. Between t = 8h and t = 24 h the sample has a heterogeneouscomposition, presenting a bimodal hyperfine field distribution with maxima centred at 34.3 T and35.8 - 36.4 T, compatible with the presence of different Fe environments (richer in Co and richerin Fe, respectively). After 48 h of milling, the sample presents a more homogeneous compositionshowing 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-rayphotoelectron spectroscopy data indicate that the native oxide layer formed on the freshly milledsamples contains Co2+, Fe2+ and Fe3+ oxides. After complete removal of this native oxide layer byAr ion bombardment, X-ray photoelectron spectroscopy analysis yields the composition of thenominal equiatomic Fe50Co50 alloy.