Title

Internal Friction of Sodium Phosphate Glasses

Abstract

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.

Department(s)

Materials Science and Engineering

Keywords and Phrases

Glass

International Standard Serial Number (ISSN)

0022-3093; 1873-4812

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 1974 Elsevier, All rights reserved.

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