1992 年 21 巻 3 号 p. 149-160
Recent studies on pressure-induced structural changes in silicate glass (melt) by various spectroscopic techniques are reviewed. The following changes have been observed with increasing pressure; reduction of Si-O-Si angle, change in Qn distribution, and formation of high-coordination Si (Siv and SiVI). Systematic change of high-coor-dination Si with pressure and composition reveals that high-coordination Si is produced by consuming non-bridging ox-ygens in alkali-silicates. The importance of Siv for dynamic process is discussed.