Internal Friction of Glasses with Low Water Contents
Internal friction was measured for NaPO3 glasses containing from 0.0004 to 0.146 wt% H2O. In glasses containing ≤ 0.001 wt% H2O, the only internal friction peak observed was that resulting from the Na+ ions, i.e. the alkali peak; it was ~ 30% larger than in as-melted glasses. The second peak normally observed in as-melted NaPO3 glass was completely absent when the water content was < 0.001 wt%, consistent with the interpretation that it is caused by a reorientation of proton-Na+ elastic dipoles. The concept that the second peak in as-melted alkali phosphate and silicate glasses results from nonbridging oxygen ions is not substantiated by these studies of NaPO3 glasses, which contain a high percentage of these ions but do not exhibit this peak when the proton concentration is sufficiently low.
D. E. Day, "Internal Friction of Glasses with Low Water Contents," Journal of the American Ceramic Society, vol. 57, no. 12, pp. 530-533, Wiley-Blackwell, Dec 1974.
The definitive version is available at http://dx.doi.org/10.1111/j.1151-2916.1974.tb10803.x
Materials Science and Engineering
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