Abstract
Oxygen bubble formation has been observed in sodasilicate glasses during irradiation. Although the irradiation always produces a consistent microstructure of oxygen microbubbles and an amorphous phase decomposition, there is a substantial difference between the rate at which the damage occurs. When a sample has been previously gamma irradiated, the damage occurs at much greater rates when compared to in situ irradiation in the electron microscope. It has been suggested that it is not the radiation damage rate that is responsible for this behavior but rather the presence of an electric fieldFigure 1 illustrates the microstructure found in a sodasilicate glasses showing the characteristic bubble formation on the perimeter of the area illuminated by the beam and the phase separation within the interior.
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