2014-Sustainable Industrial Processing Summit
SIPS 2014 Volume 5: Composite, Ceramic, Quasi-crystals, Nanomaterials & Coatings
| Editors: | Kongoli F |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2014 |
| Pages: | 578 pages |
| ISBN: | 978-1-987820-07-2 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Importance of the interstitial region for producing magnetism in nanostructured Al-Cu-Fe phases
Carlos Landauro1; Mirtha Pillaca2; Milida Pinto1;1SAN MARCOS UNIVERSITY, Lima, Peru; 2UNMSM, Lima, Peru;
Type of Paper: Regular
Id Paper: 393
Topic: 6
Abstract:
The formation and growth of a magnetic interstitial region after reducing the grain size has been investigated in i-Al64Cu23Fe13 quasicrystalline and w-Al70Cu20Fe10 crystalline phases. The Al-Cu-Fe samples were obtained by arc furnace technique and then nanostructured by means of mechanical milling. The results indicate that the solid samples present a weak ferromagnetic behavior at 300 K, showing a saturation magnetization of 0.124 emu/g for the icosahedral phase (i-phase) and 0.449 emu/g for the tetragonal phase (w-phase). These small values indicate that only a few percentage of the Fe atoms carry magnetic moment. The magnetic response in the nanostructured w-phase increases up to 3.5 times higher than its corresponding solid counterpart.
Surprisingly, for the case of the i-phase this increment is about 16 times, which implies a larger magnetic interstitial region in this phase. Moreover, the speed of the variation of the studied physical parameters after reducing the average grain size has been obtained from the exponent of a power law fit of the experimental data. The values of this exponent, corresponding to the magnetic response, are slightly different in each phase, which should be related to the different chemical composition and/or the type of long range order.