Formation of nanostructured ω-Al7Cu2Fe crystalline phase by the ball milling technique

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Abstract

Crystalline ω-Al7Cu2Fe bulk samples were prepared by arc furnace and then by means of milling, the average grain size of these samples is reduced to the nanometer scale. The structural and magnetic properties of the nanostructured ω-Al7Cu2Fe phase have been studied by X-ray diffraction employing Rietveld method, Mössbauer spectroscopy and vibrating sample magnetometry. The results indicate that the average grain size of the synthesized sample (ω-phase) rapidly decreases from 79 to 12 nm after 5 h of milling. Furthermore, the hyperfine parameters of the nanostructured samples are higher than the values for the bulk ω-phase. Magnetic measurements show a weak ferromagnetic behavior with Ms = 0.46 emu.g-1 for the bulk ω-phase. After the milling process this value increases to Ms = 1.50 emu.g-1 due to the formation and growth of a magnetic interstitial region after reducing the average grain size of the sample.

Original languageEnglish
Pages (from-to)83-88
Number of pages6
JournalHyperfine Interactions
Volume224
Issue number1-3
DOIs
StatePublished - Jan 2014
Externally publishedYes

Bibliographical note

Funding Information:
Acknowledgements M. Z. Pinto and M. Pillaca thank the “Zuñiga and Rivero Family Association” for financial support under its fellowship program for master studies in the National University of San Marcos.

Copyright:
Copyright 2013 Elsevier B.V., All rights reserved.

Keywords

  • Mössbauer spectroscopy
  • Nanostructured materials
  • X-ray diffraction
  • ω-AlCuFe phase

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