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Title: Thermal-induced microstructural changes of nickel-iron cyanide
Authors: Ng, C.W.
Ding, J. 
Wang, L.
Gan, L.M.
Quek, C.H.
Issue Date: 28-Sep-2000
Citation: Ng, C.W.,Ding, J.,Wang, L.,Gan, L.M.,Quek, C.H. (2000-09-28). Thermal-induced microstructural changes of nickel-iron cyanide. Journal of Physical Chemistry A 104 (38) : 8814-8822. ScholarBank@NUS Repository.
Abstract: Molecular-based magnet nickel - iron cyanide, K0.8Ni1.1[Fe(CN)6]·4.5H2O, was prepared by coprecipitation. The powder X-ray diffraction indicates an fee crystal structure with a unit cell constant of 10.4 Å. Its Curie temperature was determined to be 28 K from the Curie-Weiss law. The effects of heat treatment on the microstructures as well as magnetic properties in the compound were studied. Several structures were encountered during the course of annealing from room temperature to 600 °C. The conversion of the ferromagnetic FeIII-CN-NiII linkage to a paramagnetic FeII-CN-NiIII linkage occurred after heat treatment at 150 °C in argon. There was another cyanide structure with a tentative composition of (Ni, Fe)(CN)2-3O1-2, which possessed a Curie temperature of 50-60 K and is expected to be ferrimagnetic. Above 550 °C, the cyanide compound decomposed into a mixture of fee Fe-Ni and amorphous carbon. In a separate experiment, fairly pure fee Fe-Ni particles were prepared by microemulsion method followed by decomposition at 600 °C under a partial pressure of air. The ultrafine particles were found to have a mean particle size of ∼10 nm, a saturation magnetization of 110 emu/g, and a coercivity of 0.3 kOe. © 2000 American Chemical Society.
Source Title: Journal of Physical Chemistry A
ISSN: 10895639
Appears in Collections:Staff Publications

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