Studies on melt structure and crystallization of AbxAnx Diy silicate melts near cotectio-line by Raman spectroscopy.

From high-temperature molten, a series of silicate melts near cotectic-line were quenched or cooled with different rate. The experiment samples are analyzed by micro-Raman spectroscopy. The changes of melt structure of Ab(x)An(x)Di(x) silicate melts across phase border are compared systematically. The heredity of crystal structure from melt structure is also discussed. It is shown that the relative concentration of melt structure unit varies abruptly in some extent across the phase border. The changes of melt structure have different effects on melt viscosity and density. The Raman spectroscopy measurements indicate that silicate glass structure is insensitive to cooling rate. From the point of heredity of crystal from melt, it means that the crystal growth units are closely related with melt structure units.