Doctoral Dissertations

Abstract

"The mixed alkali effect in silicate glasses was examined from internal friction measurements made over the temperature range from -190 to 500⁰C and at a frequency of 0.4 Hz. Supplemental measurements of the activation energy for the different internal friction peaks, dynamic shear modulus, density, and index of refraction were also made. All measurements were confined to silicate glasses containing mixtures of Li-Na, Li-K, Li-Rb, Li-Cs, Na-K, Na-Rb, Na-Cs, and K-Rb. Rötger's interpretation of the internal friction of mixed-alkali silicate glasses is shown to be incorrect. A previously unreported internal friction peak was observed whenever two different alkali oxides were present simultaneously, The behavior of this peak in the different mixed alkali glasses is more easily correlated with the radius ratio of the two alkali ions present than with the mass ratio. A stress induced alkali ion position interchange is suggested as the probable mechanism responsible for this peak"--Abstract, page ii.

Advisor(s)

Day, D. E.

Committee Member(s)

Moore, Robert E., 1930-2003
Lewis, Gordon
Tappmeyer, Wilbur P.
James, William Joseph

Department(s)

Materials Science and Engineering

Degree Name

Ph. D. in Ceramic Engineering

Sponsor(s)

United States. Army Research Office

Publisher

University of Missouri at Rolla

Publication Date

1965

Pagination

xii, 182 pages

Note about bibliography

Includes bibliographical references (pages 115-118).

Rights

© 1965 James E. Shelby, All rights reserved.

Document Type

Dissertation - Open Access

File Type

text

Language

English

Library of Congress Subject Headings

Alkalies
Glass-ceramics
Internal friction
Silicates

Thesis Number

T 2067

Print OCLC #

9526948

Electronic OCLC #

800405830

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