Doctoral Dissertations

Author

Gary L. McVay

Abstract

"The internal friction and self diffusion coefficients of sodium and rubidium ions for (1 - X) Na₂O·X Rb₂O·3 SiO₂ glasses have been measured. The diffusion measurements employed radioactive isotopes and a thin sectioning technique and extended from 350 to 500°C. Internal friction measurements were made from -150 to 500°C and at frequencies of 0.05 to 6000 Hz. The maximum height for the mixed alkali internal friction peak occurs at the composition where the sodium and rubidium diffusion coefficients are equal. It is concluded that the mechanism responsible for the mixed alkali peak is a cooperative rearrangement of sodium-rubidium ions and that the slowest moving ion controls the rate of this rearrangement. This mechanism should also apply to other mixed alkali silicate glasses since the internal friction for these systems is similar. The height of the alkali peak was compared with the corresponding alkali ion diffusion coefficient for several alkali aluminosilicate and silicate glasses. A direct correlation was found between the height of an alkali peak and the magnitude of the diffusion coefficient of the appropriate alkali ion"--Abstract, page ii.

Advisor(s)

Day, D. E.

Committee Member(s)

Leighley, Hollis P.
Moore, Robert E., 1930-2003
Wuttig, Manfred

Department(s)

Materials Science and Engineering

Degree Name

Ph. D. in Ceramic Engineering

Sponsor(s)

National Science Foundation (U.S.)
United States. National Aeronautics and Space Administration

Publisher

University of Missouri--Rolla

Publication Date

1970

Pagination

vii, 54 pages

Note about bibliography

Includes bibliographical references (pages 52-53).

Rights

© 1970 Gary Lee McVay, All rights reserved.

Document Type

Dissertation - Open Access

File Type

text

Language

English

Library of Congress Subject Headings

Glass
Internal friction -- Measurement
Alkali metal compounds
Sodium compounds

Thesis Number

T 2382

Print OCLC #

6020270

Electronic OCLC #

853459164

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