Preparation of Ultrafine Cobalt Ferrite Particles by Solution SHS Method

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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).

Info:

Periodical:

Advanced Materials Research (Volumes 284-286)

Main Theme:

Edited by:

Xiaoming Sang, Pengcheng Wang, Liqun Ai, Yungang Li and Jinglong Bu

Pages:

645-648

DOI:

10.4028/www.scientific.net/AMR.284-286.645

Citation:

X. E. Li and X. H. Zhu, "Preparation of Ultrafine Cobalt Ferrite Particles by Solution SHS Method", Advanced Materials Research, Vols. 284-286, pp. 645-648, 2011

Online since:

July 2011

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$35.00

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