Abstract
Recent experimental evidence in favor of a vacancy model of ionic transport in glasses is discussed. The model is applied to new internal friction data on binary sodium silicate glasses. The second, high-temperature peak in the internal friction spectra of these glasses is apparently due to the stress-induced diffusion of singly-bonded oxygen ions. These ions diffuse into vacancies or interstitial sites whose concentration is thermally activated. Approximately 1012 cm−3 free sites are frozen into the glass below 200°C.
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