**2.3 Characterizations techniques**

Room temperature X-Ray diffraction (XRD) analysis was carried out to determine the crystallite size, lattice strain, lattice parameter and phase analysis of the different hours milled powder sample using X-ray Diffractometer (Rigaku TTRAX 18 KW CuKα radiation). Recording of microstructure of 35 hrs nanocrystalline Mg2TiO4 milled powders has been carried out by using transmission electron microscope (TEM, JEOL 2100; JEOL, Tokyo, Japan). The surface morphology of nanocrystalline Mg2TiO4 milled powders was observed by scanning electron microscopy (SEM, Leo 1430, PV, Carl Zeiss Jena, Germany). The thermal decomposition behavior of the different hours milled powders was examined by a thermogravimetric analyzer (TGA, NETZSCH, STA 449-F3. Jupiter) at a heating rate of 10°C/min in the argon atmosphere. UV–VIS–NIR spectrophotometer (UV 3101PC, Shimdzu) was used to obtained UV/VIS absorption spectra of all the samples in the wavelength range 200–1000 nm.
