Nanocrystalline Al64Cu23Fe13 icosahedral quasicrystal has been obtained by milling of solid quasicrystal precursors prepared by arc-melt. The local structure around Fe atoms was studied by Mössbauer spectroscopy using a quadrupole splitting distribution method. Mössbauer results of annealed and milled samples show the existence of a broadened distribution of Fe sites which is associated to intrinsic disorder. The structural characterization was determined using x-ray diffraction. The average grain-size of the nanostructured quasicrystal, obtained from the line broadening of the X-ray diffraction peaks, was estimated to be of the order of 10 nm for a sample milled by 5 h.
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Acknowledgements We are grateful to J. Bravo for fruitful discussions. M. Yaro is thankful to the National University of San Marcos for partial financial support through its scientific initiation program (PIC-2006).
- Mechanical milling