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

Mohammadi, M. R ; Sharif University of Technology | 2012

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  1. Type of Document: Article
  2. DOI: 10.1007/s10971-012-2839-y
  3. Publisher: Springer , 2012
  4. Abstract:
  5. 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
  6. Keywords:
  7. Aqueous particulate sol-gel ; Crystal structure ; Magnesium titanate ; Morphology ; AFM ; Annealing temperatures ; Atomic force microscope (AFM) ; Average grain size ; Binary systems ; Field emission scanning electron microscopes ; Low temperatures ; MgO ; Molar ratio ; Morphological manipulations ; Nano-crystalline structures ; Processing parameters ; Small grains ; Sol-gel routes ; TiO ; Fourier transform infrared spectroscopy ; Magnesium ; Sol-gel process ; Sol-gels ; Thin films ; X ray diffraction ; Titanium dioxide
  8. Source: Journal of Sol-Gel Science and Technology ; Volume 64, Issue 1 , October , 2012 , Pages 135-144 ; 09280707 (ISSN)
  9. URL: http://link.springer.com/article/10.1007%2Fs10971-012-2839-y