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Diffusion and Internal Friction in Na‐Rb Silicate Glasses
Author(s) -
McVAY GARY L.,
DAY DELBERT E.
Publication year - 1970
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1970.tb16002.x
Subject(s) - rubidium , alkali metal , diffusion , ion , silicate , silicate glass , materials science , sodium , analytical chemistry (journal) , mineralogy , internal friction , chemistry , thermodynamics , composite material , potassium , physics , metallurgy , chromatography , organic chemistry
The internal friction and self‐diffusion coefficients of sodium and rubidium ions for (l‐X)Na 2 O‐XRb 2 O‐3SiO 2 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.