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

被引：30

作者：

Sharif, Md Jafar ^{[1
]}

Yamauchi, Miho ^{[1
,2
,3
]}

Toh, Shoichi ^{[3
,4
]}

Matsumura, Syo ^{[3
,4
,5
]}

Noro, Shin-ichiro ^{[6
]}

Kato, Kenichi ^{[3
,7
]}

Takata, Masaki ^{[7
]}

Tsukuda, Tatsuya ^{[1
,8
]}

机构：

[1] Hokkaido Univ, Catalysis Res Ctr, Sapporo, Hokkaido 0010021, Japan

[2] Kyushu Univ, Int Inst Carbon Neutral Energy Res WPI I2CNER, Nishi Ku, Fukuoka 8190395, Japan

[3] JST CREST, Chiyoda Ku, Tokyo 1020076, Japan

[4] Kyushu Univ, Res Lab High Voltage Electron Microscopy, Nishi Ku, Fukuoka 8190395, Japan

[5] Kyushu Univ, Dept Appl Quantum Phys & Nucl Engn, Nishi Ku, Fukuoka 8190395, Japan

[6] Hokkaido Univ, Res Inst Elect Sci, Sapporo, Hokkaido 0010020, Japan

[7] RIKEN SPring 8 Ctr, Mikazuki, Hyogo 6795148, Japan

[8] Univ Tokyo, Sch Sci, Bunkyo Ku, Tokyo 1130033, Japan

来源：

NANOSCALE | 2013年 / 5卷 / 04期

关键词：

MODIFIED POLYOL PROCESS; NANOPARTICLES; ALLOY;

D O I：

10.1039/c2nr33467d

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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.

引用

页码：1489 / 1493

页数：5

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