Doctoral Dissertations

Abstract

"Clear glasses form in the system Ag₂O-B₂O₃ up to about 35 mol.% (65 wt.%) Ag₂O. Infrared absorption, thermal expansion and density data indicated an analogy to the Na₂O-B₂O₃ system. Pentaborate-triborate group pairs appear to be formed upon the addition of Ag₂O to B₂O₃ up to 20 mol.% Ag₂O and diborate groups from 20 to 33 mol.% Ag₂O. This interpretation is supported by the comparison of the infrared absorption spectra of quenched and crystallized glasses. One crystallization product ,Ag₂O.4B₂O₃, has been identified previously. A new compound starts to appear at 28 mol.% Ag₂O. Silver is generally present as a network modifier like sodium. This was substantiated by the comparison of the molar volume of sodium and silver borate glasses. Above 27 mol.% Ag₂O some atomic silver is assumed to be present. Below 15 mol.% Ag₂O exploratory studies indicate a two-phase structure within an immiscibility gap. A low temperature internal friction peak in the glasses up to 28 mol.% Ag₂O corresponds with the alkali peak in other glasses; a high temperature peak appearing in the 34 mol.% Ag₂O glass is associated with the appearance of non-bridging oxygen in the system"--Abstract, page iii.

Advisor(s)

Kreidl, N. J.

Committee Member(s)

McDonald, H. O. (Hector O.)
Sorrell, Charles A.
Day, D. E.
Moore, Robert E., 1930-2003

Department(s)

Materials Science and Engineering

Degree Name

Ph. D. in Ceramic Engineering

Sponsor(s)

National Science Foundation (U.S.)

Publisher

University of Missouri--Rolla

Publication Date

1971

Pagination

x, 88 pages

Note about bibliography

Includes bibliographical references (pages 41-45).

Rights

© 1971 Edward Nashed Boulos, All rights reserved.

Document Type

Dissertation - Open Access

File Type

text

Language

English

Subject Headings

Borates -- ResearchSilver compounds -- Effect of temperature onGlass -- Heat treatmentBorates -- SpectraInternal friction -- Measurement

Thesis Number

T 2424

Print OCLC #

6024697

Electronic OCLC #

861279348

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