Abstract
The factors affecting the foaming of non-doped and Ge-doped silica glasses prepared by a sol-gel method have been investigated. Foaming occurred more easily in OH-containing glass samples sintered in oxygen than those sintered in helium. A probable mechanism for the foaming is by the remaining pores in the glass, caused by the low diffusivity of oxygen, which act as nuclei for the generation of water vapour. Dechlorination through oxidation during sintering was not effective in obtaining non-foaming and OH-free Ge-doped glass. It was assumed that GeCl causes the foaming.
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