"The internal friction and self diffusion coefficients of sodium and rubidium ions for (1 - X) Na₂O·X Rb₂O·3 SiO₂ glasses have been measured. The diffusion measurements employed radioactive isotopes and a thin sectioning technique and extended from 350 to 500°C. Internal friction measurements were made from -150 to 500°C and at frequencies of 0.05 to 6000 Hz. The maximum height for the mixed alkali internal friction peak occurs at the composition where the sodium and rubidium diffusion coefficients are equal. It is concluded that the mechanism responsible for the mixed alkali peak is a cooperative rearrangement of sodium-rubidium ions and that the slowest moving ion controls the rate of this rearrangement. This mechanism should also apply to other mixed alkali silicate glasses since the internal friction for these systems is similar. The height of the alkali peak was compared with the corresponding alkali ion diffusion coefficient for several alkali aluminosilicate and silicate glasses. A direct correlation was found between the height of an alkali peak and the magnitude of the diffusion coefficient of the appropriate alkali ion"--Abstract, page ii.
Day, D. E.
Leighley, Hollis P.
Moore, Robert E., 1930-2003
Materials Science and Engineering
Ph. D. in Ceramic Engineering
National Science Foundation (U.S.)
United States. National Aeronautics and Space Administration
University of Missouri--Rolla
vii, 54 pages
© 1970 Gary Lee McVay, All rights reserved.
Dissertation - Open Access
Internal friction -- Measurement
Alkali metal compounds
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McVay, Gary L., "Diffusion and internal friction in sodium-rubidium silicate glasses" (1970). Doctoral Dissertations. 2041.