STRUCTURES OF ALUMINOSILICATE MELTS - EVI DENCE FROM RAMAN-SCATTERINGSPECTRA

Glasses of the system Na2O-Al2O3SiO2 with Na2O/SiO2 > 1 were examined using Raman spectroscopy. A structural model proposed for interpreting Raman spectra was employed to deconvolute their high-frequency envelo pes into superpositions of discrete lines that are produced by charact eristic structural units. As was detected, interaction of sodium oxide with melts of albite or jadeite composition results in selective modi fication of the polymer structures of these melts, A specific feature of this process is that only the silicate constituents of the melts de polymerize, whereas their highly polymerized aluminosilicate groups do not change, and the Al/Si ratios increase with increasing N2O content s of the melt.