Abstract
The dependence of the structure and properties of two series of glasses (100–x)LiPO3−xSiO2, x = 0–20 (series I) and 50Li2O−(50–x)P2O5−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.
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