Effect of Li₂O on Physical, Structural, Thermal and Electrical Properties of MgO-V₂O₅ Glasses

Abstract

Three compositions 75V₂O₅-25MgO (MVL-0), 75V₂O₅-16MgO-9Li₂O (MVL-9) and 75V₂O₅-13MgO-12Li₂O (MVL-12) were synthesized by melt-quench technique. Addition of Li₂O instead of MgO promoted the devitrification of magnesium vanadate glass. X-ray diffraction pattern showed the amorphous nature of MVL-0, while MVL-9 and MVL-12 were seen to exhibit a lithium vanadium oxide phase with the presence of some amorphous phase. Densities of the samples increased with the increase in Li₂O concentration. Raman spectra of MVL-0 exhibited broad band as compared to the other samples; as Li₂O concentration increased, the band became sharp including the appearance of some more new bands. High electrical conductivity was observed for MVL-12; ∼9.615×10^–5 S.cm^–1 at 50°C to 1.96×10^–3 S.cm^–1 at 250°C, which is comparable to the conductivity of standard cathode materials used in battery and electrochemical fuel cells. So, these samples may be used as cathode materials due to good conductivity at 250°C for battery and electrochemical fuel cells.

GRAPHICAL ABSTRACT

Keywords:

• Glasses
• Conductivity
• Ceramics
• Diffraction
• Devitrification