Internal Friction of Sodium Phosphate Glasses
The internal friction of XNa2O·(1 - X)P2O5 glasses, X varied from 0.29 to 0.59, has been measured from -100 to +300°C at ~ Hz and from 25 to 300°C at ~ 2000 Hz. Two internal friction peaks were observed. Based on the compositional dependence of the low temperature peak and the agreement between the activation energy of this peak with that calculated from dielectric loss measurements, this peak was assigned to the stress induced movement of the sodium ions. The magnitude of the second peak occurring at higher temperature, in addition to varying with the sodium content, was also very sensitive to the water content; its magnitude increasing with increasing water content. This peak was concluded to be a type of 'mixed alkali' peak involving the cooperative movement of sodium ions and protons. Due to the shift of the background damping to lower temperatures with decreasing sodium content, neither peak could be observed for X < 0.30.
E. H. Verstegen and D. E. Day, "Internal Friction of Sodium Phosphate Glasses," Journal of Non-Crystalline Solids, vol. 14, no. 1, pp. 142-156, Elsevier, Jan 1974.
The definitive version is available at https://doi.org/10.1016/0022-3093(74)90025-8
Materials Science and Engineering
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