TITLE:
Influence of Reaction Conditions on Sol-Gel Process Producing SiO2 and SiO2-P2O5 Gel and Glass
AUTHORS:
Amany Mohamed Elnahrawy, Ahmed Ibrahim Ali
KEYWORDS:
Silica Gel, Phosphosilicate Glass, Gelation, XRD, FTIR
JOURNAL NAME:
New Journal of Glass and Ceramics,
Vol.4 No.2,
April
28,
2014
ABSTRACT: The effect of H2O and the slow thermal annealing on the
properties of pure silica (SiO2) and phosphosilicate (SiO2-P2O5)
gel-glasses are presented. The monolithic samples have been prepared via sol-gel
process using tetraethorthosilicate (TEOS), Si(C2H5O)4 and Triethylphosphate (TEP) (C2H5O)3P(O) as
SiO2 and P2O5 precursors. Phosphate
incorporates into the silicate network by substituting Si atoms and
consequently, we observed changes in structural and spectroscopic properties
for these systems. The structures of prepared samples were examined by observed
weight loss, XRD and FTIR. It has been found that in the structure of pure
silica and phosphosilicate glasses there are formed domains characterized by
certain degree of ordering of the units present in their composition, while the
structure of pure silica is still amorphous of these glasses. The changing
character of domains structure may be the reason of different chemical activities
of phosphosilicate glass.