Abstract
Two types of composite Fe(Co)Ti(O x ,OH y ) nanoflakes were prepared using the mechanochemical synthesis. TEM, XRD, EDX, magnetisation and Mossbauer spectroscopy methods were applied for the characterisation of the as-synthesised and annealed samples. For the samples with Fe:Ti = 1:1 and Fe:Co:Ti = 1:1:1 atom ratios, the as-synthesised nanoflakes were composed of feroxyhytes δ-FeOOH and β-Co(OH)2, respectively, and amorphous Ti, Fe and Co oxides as well. According to Mossbauer spectroscopy, Ti, Fe and Co cations were considerably intermixed in both composites. The average diameter of the nanoflakes was 23 and 33 nm, respectively. Annealing the samples at 550 °C led to the full crystallisation forming TiO2/Fe2O3 nanocomposite and nanocrystalline ferrite of a mixed composition consisting of a solid solution of maghemitised ulvospinel and cobalt ferrite. The samples showed magnetisation consistent with their determined structure.
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