Formation of nanostructured ω-Al 7 Cu 2 Fe crystalline phase by the ball milling technique

Autor: V. A. Peña Rodríguez, M. Z. Pinto, M. Pillaca, C. Rojas-Ayala, E. M. Baggio-Saitovitch, J. Quispe-Marcatoma, Carlos V. Landauro
Rok vydání: 2013
Předmět:
Zdroj: Hyperfine Interactions. 224:83-88
ISSN: 1572-9540
0304-3843
DOI: 10.1007/s10751-013-0868-8
Popis: 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, Mossbauer 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 M s = 0.46 emu.g–1 for the bulk ω-phase. After the milling process this value increases to M s = 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.
Databáze: OpenAIRE
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