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Issue 4, 2013
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Enhanced magnetization in highly crystalline and atomically mixed bcc Fe–Co nanoalloys prepared by hydrogen reduction of oxide composites

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Abstract

FexCo100−x nanoalloys (NAs) with 20 ≤ x ≤ 80 were prepared by hydrogen reduction of Fe–Co oxide nano-composites, which were composed of mixed phases (or domains) of Fe2O3 and CoO. In situ X-ray diffraction (XRD) measurements using synchrotron radiation clearly showed development of a solid-solution Fe–Co phase by hydrogen reduction from the oxide composites. High-resolution transmission electron microscopy (TEM), high-angle annular dark-field scanning TEM and powder XRD revealed that Fe–Co NAs form a single crystal structure and the two elements are mixed homogeneously. The saturation magnetization depends on the size and metal composition and shows the highest value (250 emu g−1) for the Fe70Co30 NA in the size range of 30–55 nm, which is comparable to that of the Fe70Co30 bulk alloy (245 emu g−1). This high magnetization is attributable to high crystallinity and homogeneous mixing of constituent atoms, which are attained by thermal treatment of oxide phases under a hydrogen atmosphere.

Graphical abstract: Enhanced magnetization in highly crystalline and atomically mixed bcc Fe–Co nanoalloys prepared by hydrogen reduction of oxide composites

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Article information


Submitted
04 Nov 2012
Accepted
29 Dec 2012
First published
03 Jan 2013

Nanoscale, 2013,5, 1489-1493
Article type
Communication

Enhanced magnetization in highly crystalline and atomically mixed bcc Fe–Co nanoalloys prepared by hydrogen reduction of oxide composites

M. J. Sharif, M. Yamauchi, S. Toh, S. Matsumura, S. Noro, K. Kato, M. Takata and T. Tsukuda, Nanoscale, 2013, 5, 1489
DOI: 10.1039/C2NR33467D

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