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Abstract

Zinc ferrite nanopowders were prepared by a combined route of sol–gel and autoignition systhesis using a complex sol composed by Fe(NO₃)₃–Zn(NO₃)₂–citric acid–EDTA–NH₄NO₃–NH₃.H₂O as a precursor. Differential thermal analysis, Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy and energy dispersive spectroscopy were used to characterise the samples. The effects of fuel ratio, calcination temperature and time on crystallinity and crystal diameter of as prepared powders were investigated. It was found that adding an assistant complex reagent such as EDTA was crucial to stabilise composition, promote uniformity of the precursor gel and prepare ZnFe₂O₄ nanopowders without impurity phases. The well crystallised ZnFe₂O₄ powders with an average crystal diameter of 13·6 nm were prepared at the optimum conditions.

Keywords

Sol–gel autoignition synthesis Nanopowders Complexation

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Preparation of ZnFe 2 O 4 nanopowders via sol–gel autoignition method

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