Mössbauer effect study of fine atomic structure of Fe50Al40Ni10 powders |
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| Authors: | F Hadef A Otmani A Djekoun JM Grenèche |
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| Institution: | 1. Laboratoire de Recherche sur la Physico-Chimie des Surfaces et Interfaces, Université de Skikda, B.P. 26 Skikda, Algeria;2. Laboratoire de Magnétisme et Spectroscopie des Solides, Université de Annaba, B.P. 12 Annaba, Algeria;3. LUNAM, Université du Maine, Institut des Molécules et Matériaux du Mans, UMR CNRS 6283, 72085 Le Mans, France |
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| Abstract: | In the present paper, we discuss the local atomic environment of Fe atoms in the mechanically alloyed Fe50Al40Ni10 powders on the basis of hyperfine data estimated from 57Fe Mössbauer spectra. Bhf decreases with increasing milling time due to the diffusion of Al and/or Ni into Fe grains. Nickel atoms did not diffuse inside the first coordination sphere of Fe and if the diffusion takes place the number is not more than one atom. Analyses of P(Bhf), indicate that the high hyperfine field values ranging from 30 to 33 T have to be partially attributed to Fe crystalline nanograins and the presence of the defects in them, the hyperfine field values ranging from 15 to 30 T can be associated to the nanocrystalline bcc Fe(Al, Ni) solid solution while the low hyperfine field values (<15 T) result from Fe atoms located in the disordered grain boundaries. |
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| Keywords: | Nanostructures Mechanical alloying 57Fe Mö ssbauer spectrometry Local environment |
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