Masters Theses

Abstract

"A series of cesium phosphate glasses, XCs2O·(1-X)P2O5, where X ≤ O.60 were prepared. The addition of ~ 16% mole Cs2O to P2O5 decreases the glass transition temperature (Tg ) by 156K. Tg increases by 25K with the further addition of cesium oxide up to 60 mole% CS2O. The density of V-P2O5 is 2.39 g/cm3, and with cesium oxide additions the cesium phosphate glass density increases monotonically to 3.88 g/cm3 (59.1 mole% Cs2O). The 31P magic angle spinning nuclear magnetic resonance (MAS NMR) spectra show that the addition of Cs2O causes a continuous conversion of the 3D ultraphosphate network to the chain metaphosphate structure. There is a break in the Q2 isotropic chemical shift (δiso) at ~35 mole% Cs2O. The 133Cs MAS NMR spectra show a 90 ppm increase in δiso, which indicates a decrease in the average electron density around the cesium, more covalent Cs-O bonding, and a shorter average Cs-O bond length. The Raman data indicates a conversion of the 3D phosphate glass network to a chain metaphosphate glass structure with the addition of Cs2O. The properties and spectroscopic results are interpreted using a structural model that considers the effects of composition on the average coordination environments of cesium ions"--Abstract, leaf 2.

Advisor(s)

Brow, Richard K.

Committee Member(s)

Day, D. E.
Blum, Frank D.

Department(s)

Materials Science and Engineering

Degree Name

M.S. in Ceramic Engineering

Comments

Financial support of Sandia National Labs and the Appleyard Fund (UMR) is gratefully acknowledged. Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the United States Department of Energy under Contract DE-AS04-94AL8500.

Publisher

University of Missouri--Rolla

Publication Date

Spring 2000

Pagination

ix, 102 pages

Note about bibliography

Includes bibliographical references.

Rights

© 2000 Carol Ann Click, All rights reserved.

Document Type

Thesis - Restricted Access

File Type

text

Language

English

Thesis Number

T 7723

Print OCLC #

44637690

Electronic OCLC #

1104791302

Link to Catalog Record

Electronic access to the full-text of this document is restricted to Missouri S&T users. Otherwise, request this publication directly from Missouri S&T Library or contact your local library.

http://laurel.lso.missouri.edu/record=b4443159~S5

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