Title

Mechanical Damping Spectrum for Mixed-Alkali R2 O·Al2 O3·6SiO2 Glasses

Abstract

The internal friction of R2O·Al2O3·6SiO2 glasses was measured from-180° to 700°C at 0.4 Hz. Glasses containing Li2O or Na2O exhibited only the one internal friction peak characteristic of the stress-induced movement of the alkali ions. Substitution of a second alkali resulted in two significant changes in the internal friction: (1) a rapid reduction in the magnitude of the original alkali peak and (2) the appearance of a new internal friction peak whose magnitude was especially sensitive to the concentration of the second alkali. Each combination of two alkali ions resulted in a new peak, with peaks being observed for the combinations Li-Na, Na-K, and Li-K. A mechanical damping spectrum is predicted for aluminosilicate glasses containing more than two alkali ions.

Department(s)

Materials Science and Engineering

Keywords and Phrases

Glass; In; Internal Friction; Jacta; Mechanical Properties; Silicates

International Standard Serial Number (ISSN)

27820

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 1969 Wiley-Blackwell, All rights reserved.

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