Structure of high-alkali aluminosilicate melts from the high-temperature Raman spectroscopic data

The Raman scattering spectra of the 30Na(2)O . 70(25NaAlO(2) . 75SiO(2)) (mol %) melt are measured at high temperatures. A comparison of the Raman scattering spectra of the melt and the glass is carried out. It is demonstrated that, with an increase in the temperature and upon the melt-glass transition, the aluminum distribution among the anion groups characterized by different degrees of polymerization becomes more random and the melt structure is more homogeneous compared to the glass structure.