Structural inhomogeneity in glasses from the system Li2O3-Al2O3 -SiO2 revealed by IR spectroscopy

MIR spectra of lithium silicates and aluminosilicates were measured and compared with the simulated spectra. Simulation was carried out by mathematical summation of appropriate glass spectra taken in the right proportion. It was shown that the spectra obtained in this way are very similar to the measured spectra. It confirms phase inhomogeneity of studied glasses with short or even medium range of order. Structures of lithium silicate and aluminosilicate glasses consist of structural elements resulting from its composition and position in the field of primary crystallisation. The structure of these elements is very similar to their crystalline analogues with the same chemical composition, but they are much more disordered and do not have translation symmetry.