Title

Diffusion and Internal Friction in Na-Rb Silicate Glasses

Abstract

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.

Department(s)

Materials Science and Engineering

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 1970 Wiley-Blackwell, All rights reserved.


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