8). The inset Fig. 8 shows strong and prominent NVP-BHG712 spectrum band with maximum around 192 nm which can arise due to transition between valence band to conduction band . The smaller sized crystallites were found to have high surface to volume ratio which results in increase of defects distribution on the surface of nanomaterials and exhibit strong absorption bands . In MgO:Fe3+, the particles size was in nanometer which results in high surface to volume ratio as a result, there is an increase in defects distribution on the surface of the nanomaterials.