Ultrafine magnetic cyanide particles

被引：16

作者：

Ng, CW ^{[1
]}

Ding, J

Chow, PY

Gan, LM

Quek, CH

机构：

[1] Natl Univ Singapore, Dept Mat Sci, Singapore 119260, Singapore

[2] Natl Univ Singapore, Dept Chem, Singapore 119260, Singapore

[3] Inst Mat & Res Engn, Singapore 119260, Singapore

来源：

JOURNAL OF APPLIED PHYSICS | 2000年 / 87卷 / 09期

关键词：

D O I：

10.1063/1.372608

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Cobalt- and nickel-iron hexacyanide powders were synthesized by the microemulsion method using CoCl2 or NiCl2 and K3FeIII (CN)(6). The resultant powders K0.2Co1.4[Fe(CN)(6)].6.5H(2)O and K0.8Ni1.1[Fe(CN)(6)].4.5H(2)O were single phase with a mean particle size in the range of 5-10 nm. Curie temperatures of the cobalt- and nickel-iron cyanide powders were estimated to be 14 and 28 K, respectively, using Curie-Weiss law. The coercivity was measured to be 1.8 kOe for nanoscaled Co-Fe cyanide particles. High coercivity of 4.0 kOe was achieved in the coprecipitated Ni-Fe cyanide powder. Superparamagnetic behavior was observed in the microemulsion-derived Ni-Fe cyanide particles. It has been found that a heat treatment at 150 degrees C led to a presence of a soft magnetic phase and a strong reduction of magnetic anisotropy. (C) 2000 American Institute of Physics. [S0021-8979(00)18508-1].

引用

页码：6049 / 6051

页数：3

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