The crystallisation of sodium silicate glasses doped with 0, 3, 5, 7 or 11 mol% vanadium oxide has been investigated by ultraviolet-visible (UV-Vis) and Fourier transform infrared (FTIR) spectroscopy, XRD and SEM. The results showed that, with increasing vanadium oxide content, light transmission through sodium silicate glasses was reduced due to ligand field and charge transfer mechanisms, and coloured glass was developed in some special wavelengths. The presence of vanadium oxide in sodium silicate glasses also leads to formation of crystalline phases. The effect of vanadium oxide on the constituent units of glass network was investigated by mans of infrared spectroscopy in the 400-4000cm-1 region. On increasing the vanadium oxide up to 11 mol% it was identified that new peak was shifted to 615 cm-1 by heat treatment. XRD showed that on increasing the heat treatment temperature up to 900 deg C strong diffraction peaks appeared.
