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Mössbauer study of incompletely alloyed nanocrystalline Fe100 −  x Al x prepared by high energy ball milling

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Abstract

Mechanically alloyed Fe100 − x Al x powders, with 20≤ x ≤90, have been studied by X-ray diffraction and room temperature 57Fe Mössbauer spectroscopy. The milling time was chosen such that complete alloying does not take place. For a fixed milling time of 10 h, the rate of alloying was seen to increase exponentially with increase in Fe content. Mössbauer spectra of all the samples consist of a broad magnetic sextet and a quadrupole doublet. The isomer shifts and quadrupole splitting of the doublets are typical of Al-rich, Fe–Al alloys. The area under the quadrupole doublet is a maximum for x = 66. Analysis of the Mössbauer spectra indicates the formation off- stoichiometric Fe3Al phase for x < 66, while the formation of Fe clusters is largely responsible for the magnetic hyperfine component in x ≥ 66 compositions.

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Authors and Affiliations

  1. Department of Physics, Mohanlal Sukhadia University, Udaipur, 313001, India

    Varkey Sebastian, N. Lakshmi & K. Venugopalan

  2. Department of Physics, Nirmalagiri College, Kerala, 670701, India

    Varkey Sebastian

Authors
  1. Varkey Sebastian
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  2. N. Lakshmi
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  3. K. Venugopalan
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Correspondence to N. Lakshmi.

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Sebastian, V., Lakshmi, N. & Venugopalan, K. Mössbauer study of incompletely alloyed nanocrystalline Fe100 −  x Al x prepared by high energy ball milling. Hyperfine Interact 174, 127–135 (2007). https://doi.org/10.1007/s10751-007-9578-4

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