Structure and properties of (1–x)LiPO3−xSiO2 and 50Li2O−(50–x)P2O5−xSiO2 glass-forming systems

Abstract

The dependence of the structure and properties of two series of glasses (100–x)LiPO_3−xSiO₂, x = 0–20 (series I) and 50Li₂O−(50–x)P₂O_5−xSiO₂, x = 0–10 (series II) were studied. The amorphous state of the composites was confirmed by XRD. In series II, a mixed glass-forming effect was revealed with a nonmonotonic increase of the glass transition temperature and electric conductivity. The structural features of the glasses were studied by Raman and IR spectroscopy. In the Raman spectra, vibrations of SiO₄ groups with three and four oxygen bridging atoms were found; in the IR spectra, the intensities of the bands of the metaphosphate units decreased, while those of the P–O–Si bonds and pyrophosphate groups increased; in system II, the ion conductivity increased with x at room temperature by more than an order of magnitude and reached its maximum of 3.6 × 10^–8 S/cm at x = 5.