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

Md Jafar Sharif, Miho Yamauchi, Shoichi Toh, Syo Matsumura, Shin Ichiro Noro, Kenichi Kato, Masaki Takata, Tatsuya Tsukuda

研究成果: Contribution to journalArticle

22 被引用数 (Scopus)

抄録

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 Fe 70Co30 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.

本文言語英語
ページ(範囲)1489-1493
ページ数5
ジャーナルNanoscale
5
4
DOI
出版ステータス出版済み - 2 21 2013

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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