Tailoring of morphology and crystal structure of nanomaterials in MgO–TiO2 system by controlling Mg:Ti molar ratio |
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| Authors: | M R Mohammadi D J Fray |
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| Institution: | 1. Department of Materials Science & Engineering, Sharif University of Technology, Azadi Street, Tehran, Iran
2. Department of Materials Science & Metallurgy, University of Cambridge, Pembroke Street, Cambridge, CB2 3QZ, UK
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| Abstract: | The morphological manipulation and structural characterisation of TiO2?CMgO binary system by an aqueous particulate sol?Cgel route were reported. Different crystal structures including pure MgTiO3, mixtures of MgTiO3 and TiO2 and mixtures of MgTiO3 and Mg2TiO4 were tailored by controlling Mg:Ti molar ratio and annealing temperatures as the processing parameters. X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) revealed that all compounds crystallised at the low temperature of 500?°C. Furthermore, it was found that the average crystallite size of the compounds depends upon the Mg:Ti molar ratio as well as the annealing temperature, being in the range 3?C5?nm at 500?°C and around 6?nm at 700?°C. Field emission scanning electron microscope (FE-SEM) analysis revealed that the deposited thin films had nanocrystalline structure with the average grain size of 25?C30?nm at 500?°C depending upon the Mg:Ti molar ratio. Moreover, atomic force microscope (AFM) images presented that the thin films had a hill-valley like morphology made up of small grains. |
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