Doctoral Dissertations

Abstract

"The distribution of relaxation times for the alkali peak in a Li₂ O·A1₂O₃ ·2.0SiO₂ glass and for the mixed alkali peak in a 0.5Li₂O·0.5Na₂O·A1₂O₃·2.OSiO₂ glass was studied using the internal friction technique. A lognormal distribution of relaxation times provided the best agreement with the experimental data. The ß parameter of the lognormal distribution function, which is related to the half-height peak width, varied with temperature, indicating that the distribution of relaxation times is dependent upon the activation energy and the activation entropy of the relaxation mechanism. The major contributor to the distribution of relaxation times is a wide distribution in the activation entropy, while the distribution in activation energy is relatively narrow. No noticeable change in internal friction was found when precautions were taken to eliminate any surface water on a specimen"--Abstract, Page ii.

Advisor(s)

Day, D. E.

Committee Member(s)

Foster, J. Earl
Davis, Robert L.
Moore, Robert E., 1930-2003
Hansen, Peter G., 1927-2010

Department(s)

Materials Science and Engineering

Degree Name

Ph. D. in Ceramic Engineering

Sponsor(s)

National Defense and Education Act Title IV Fellowship

Publisher

University of Missouri--Rolla

Publication Date

1970

Pagination

vii, 75 Pages

Note about bibliography

Includes bibliographical references (Pages 71-74).

Rights

© 1970 David Wayne Moore, All rights reserved.

Document Type

Dissertation - Open Access

File Type

text

Language

English

Library of Congress Subject Headings

Glass
Aluminum silicates
Relaxation phenomena
Internal friction

Thesis Number

T 2359

Print OCLC #

6019694

Electronic OCLC #

845044614

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