Preparation of Ultrafine Cobalt Ferrite Particles by Solution SHS Method

Abstract:

Nanosized CoFe₂O₄ powders of 12nm particle size were directly prepared by solution SHS method at room temperature. The overall process involves three steps: formation of homogeneous sol; formatiom of dried gel; and combustion of the dried gel. Experiments revealed that CoFe₂O₄ dried gel derived from citrate and nitrate sol exhibited self-propagation combustion(SHS) at room temperature once it was ignited in air. After self-propagating combustion, the gel directly transforms into nanosized CoFe₂O₄ particles. The self-propagating combustion was considered as a heat-induced exothermic oxidation-reduction reaction between nitrate ions and carboxyl group. Differential thermal analysis-thermogravimetry (DTA-TG) was used to study the decomposition of the precursor. The structure of the nanosized CoFe₂O₄ powders was characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM).

• Periodical: Advanced Materials Research (Volumes 284-286)
• Pages: 645-648
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.284-286.645
• Online since: July 2011
• Authors: Xi En Li, Xu Hua Zhu
• Keywords: CoFe₂O₄, Nanosized Powders, Solution Shs Method

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