An analysis of helium and neon transport in vitreous silica is consistent with a statistically distributed structure of the random network. The jump distance, d , for diffusion in common borosilicate glass is greater than in vitreous silica due to the additional modifier ions, Na + . The addition of Na + or K + to a silicate structure produces an increase in d . The vibrational frequencies for a gas atom in a “doorway” ( v *) and in a solubility site ( v ) indicate structural trends such as phase separation.
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Shackelford et al. (1980) studied this question.
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