Diffusion and Internal Friction in Na-Rb Silicate Glasses
The internal friction and self-diffusion coefficients of sodium and rubidium ions for (l-X)Na2O-XRb2O-3SiO2 glasses were measured. Diffusion was measured by radioactive isotopes and a thin-sectioning technique at 350° to 500°C. Internal friction was measured at −140° to 500°C and 0.05 to 6000 Hz. the maximum height for the mixed-alkali internal friction peak occurs at the composition at which the Na and Rb diffusion coefficients are equal. It is concluded that the mechanism responsible for the mixed-alkali peak is a coupled, cooperative rearrangement of sodium and rubidium ions, with the slower moving ion controlling the rate of rearrangement. This mechanism should also apply to other mixed-alkali silicate glasses since the internal friction for these systems is similar.
G. L. McVay and D. E. Day, "Diffusion and Internal Friction in Na-Rb Silicate Glasses," Journal of the American Ceramic Society, Wiley-Blackwell, Sep 1970.
The definitive version is available at http://dx.doi.org/10.1111/j.1151-2916.1970.tb16002.x
Materials Science and Engineering
Article - Journal
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