Abstract
SiO 2 gels containing from 3.7 to 40 mol.% Na 2O have been synthesized by the hydrolysis and polycondensation of metal organic precursors. The effect of Na 2O content on thermal processing variables includes: evacuation of residual organic residues, decomposition of carbonates ( T ce), beginning of densification ( T db) and initiation of crystallization ( T ci). Thermal control of the gel-glass conversion is shown to be a function of Na 2O content and ΔT v = T ci − T db. At high Na 2O content (> 33 mol.%) ΔT v is very small whereas at the Na 2OSiO 2 eutectic compositio it is nearly 200°C. By using this method Na 2OSiO 2 glasses are obtained in the range of 440–640°C.
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