The role of Ni2+ ions on structural and spectroscopic properties of Li2O-ZrO2-Y2O3-SiO2 glass system

The glasses of composition (35-x) Li2O-5ZrO2-10Y2O3-50SiO2: x NiO (0 < x < 0.5) have been synthesized. The amorphous nature of the samples is verified by XRD studies and DTA studies. The information on of various structural vibrational units (viz., zirconate, silicate) and their compositional dependence of is evaluated by FT-IR and Raman studies. The results of these studies have indicated that there is a growth of asymmetrical bands at the expense of symmetrical bands of silicate units with increasing concentration of NiO. The optical absorption (OA) and photoluminescence (PL) spectral of Li2O-ZrO2-Y2O3-SiO2: NiO glasses indicated gradual increase of octahedral occupancy of Ni2+ ions in the glass network with the increase in the concentration of NiO in the glass network.