Comparative Roles of Al3+ and Fe3+ Ions for Network Construction in Sodium Silicate Melts

摘要: The Raman spectra of Na 2 O-Al O 3 -SiO system with different Al contents (up to 25mol%) and O/SiO ratio from 1 have been measured at 673 K. In the disilicate systems, do not change significantly increasing content except development 500 cm -1 band which is assigned three-dimensional network structural unit consisted Si 4+ 3+ ions. Also it found that ions possibly interact monomers form structures. metasilicate intensities 950 850 bands gradually decrease while 100 increases increase content. According following equilibrium reaction in composition, - O-Si-O (chain-like unit) ⇔ Si-O 2- (monomer) + 0 (sheet-like confirmed systems polymerized silicate anions, such as chain-like or sheet-like units. On other hand, has a high tendency SiO 4 construct units involving randomly. So obvious role for constructing structure be quite Fe .