Abstract
Infrared (IR) absorption spectra in bulk silica glasses with various OH contents were measured. IR absorption value at around 3600 cm-1, a direct indication of SiO4 local structure around OH, changes with changing thermal-treatment temperature. This temperature is regarded to correspond to the “local fictive temperature” of the system. The local structural relaxation around OH is discussed in relation to spatially averaged structural relaxation, and it was revealed that the former relaxes faster than the latter. The local structural relaxation seems to be the origin of structural sub-relaxation that exists besides the main relaxation, due to the collective viscous flow of the system.
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