"The mixed alkali effect in silicate glasses was examined from internal friction measurements made over the temperature range from -190 to 500⁰C and at a frequency of 0.4 Hz. Supplemental measurements of the activation energy for the different internal friction peaks, dynamic shear modulus, density, and index of refraction were also made. All measurements were confined to silicate glasses containing mixtures of Li-Na, Li-K, Li-Rb, Li-Cs, Na-K, Na-Rb, Na-Cs, and K-Rb. Rötger's interpretation of the internal friction of mixed-alkali silicate glasses is shown to be incorrect. A previously unreported internal friction peak was observed whenever two different alkali oxides were present simultaneously, The behavior of this peak in the different mixed alkali glasses is more easily correlated with the radius ratio of the two alkali ions present than with the mass ratio. A stress induced alkali ion position interchange is suggested as the probable mechanism responsible for this peak"--Abstract, page ii.
Day, D. E.
Moore, Robert E., 1930-2003
Tappmeyer, Wilbur P.
James, William Joseph
Materials Science and Engineering
Ph. D. in Ceramic Engineering
United States. Army Research Office
University of Missouri at Rolla
xii, 182 pages
© 1965 James E. Shelby, All rights reserved.
Dissertation - Open Access
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Shelby, James E., "Internal friction of mixed-alkali silicate glasses" (1965). Doctoral Dissertations. 1867.