Nanocrystalline materials like Sn doped In2O3 Indium Tin Oxide (ITO) were prepared by this Combustion technique and characterized. Presence of electronic centres in Nanocrystalline ITO is observed from Raman studies and therefore the same has been confirmed by photoluminescence studies. The oxidation properties of ITO were studied by X-ray Diffract meter grain sizes are confirmed by structural studies. As against the expectation of oxide on individual Nano grains of In-Sn alloy, ITO Nano grains grew into faceted Nano grains on heat treatment in air and O2 atmosphere. The expansion of ITO under O2 atmosphere showed pentagon symmetry. This Nanocrystalline ITO has been studied using Electron paramagnetic resonance (EPR) measurements. Structural studies by X-ray diffraction (XRD) showed the presence of dominant β phase with a minor quantity of α phase. In EPR, isotopic chemical shift peaks were observed and that they are assigned to originate from the α, β phases of ITO and grain boundary component respectively. From this study, different atomic arrangements were identified in grain boundaries compared to an equivalent within the grain in Nanocrystalline ITO.
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