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Title: Ultrafine magnetic cyanide particles
Authors: Ng, C.W.
Ding, J. 
Chow, P.Y.
Gan, L.M. 
Quek, C.H. 
Issue Date: 1-May-2000
Citation: Ng, C.W.,Ding, J.,Chow, P.Y.,Gan, L.M.,Quek, C.H. (2000-05-01). Ultrafine magnetic cyanide particles. Journal of Applied Physics 87 (9 III) : 6049-6051. ScholarBank@NUS Repository.
Abstract: 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].6.5H2O and K0.8Ni1.1[Fe(CN)6].4.5H2O 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°C led to a presence of a soft magnetic phase and a strong reduction of magnetic anisotropy. © 2000 American Institute of Physics.
Source Title: Journal of Applied Physics
ISSN: 00218979
Appears in Collections:Staff Publications

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