Studies on dielectric features of Li₂O-Ga₂O₃-SiO₂: Cr₂O₃/MoO₃/WO₃ glass systems

This investigation consists of results of the studies on dielectric properties and a.c. conductivity of Li₂O-Ga₂O₃-SiO₂ (LGS) glass with 2.0 mol% of Cr₂O₃, MoO₃, WO₃ across 0.01 Hz to 1 MHz and 20 °C to 240 °C. Structural analysis using optical absorption and IR spectra indicated dopant ions predominantly in Cr³⁺, Mo⁶⁺/Mo⁵⁺, W⁶⁺ states, and occupied T_d and O_h positions. Dielectric constant and conductivity were found to be the maximal for LGSMo glass, with the lowest impedance, while LGSCr glass exhibited the opposite trend. From the analysis of dipolar relaxation effects probable dipoles were identified in each glass. Studies on conductivity revealed that contribution of ionic components is very low and a substantial polaronic contribution in LGSMo glass, whereas, LGSCr glass showed a larger ionic component, specifically Li⁺ ion diffusion and hence more useful material for solid-state batteries with respect to the other two glasses.