Mössbauer study of incompletely alloyed nanocrystalline Fe100???
x
Al
x
prepared by high energy ball milling |
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Authors: | Varkey Sebastian N Lakshmi K Venugopalan |
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Institution: | 1. Department of Physics, Mohanlal Sukhadia University, Udaipur, 313001, India 2. Department of Physics, Nirmalagiri College, Kerala, 670701, India
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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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