Tailoring of morphology and crystal structure of nanomaterials in MgO-TiO 2 system by controlling Mg:Ti molar ratio

M. R. Mohammadi, D. J. Fray

    Research output: Contribution to journalArticlepeer-review

    3 Citations (Scopus)

    Abstract

    The morphological manipulation and structural characterisation of TiO 2-MgO binary system by an aqueous particulate sol-gel route were reported. Different crystal structures including pure MgTiO 3, mixtures of MgTiO 3 and TiO 2 and mixtures of MgTiO 3 and Mg 2TiO 4 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 3-5 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 25-30 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.

    Original languageEnglish
    Pages (from-to)135-144
    Number of pages10
    JournalJournal of Sol-Gel Science and Technology
    Volume64
    Issue number1
    DOIs
    Publication statusPublished - Oct 2012

    Keywords

    • Aqueous particulate sol-gel
    • Crystal structure
    • Magnesium titanate
    • Morphology

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