Masters Theses

Abstract

"The glass formation region of the Ho2O3∙Al2O3∙SiO2 system was determined to extend from 9 to 30 mole percent Ho2O3. The chemical durability of these glasses was examined in physiological solutions to determine the feasibility of their use for in-vivo radiotherapeutic applications. The dissolution rates of bulk glass specimens were barely measurable in distilled water at 37 or 70 °C, but increased with temperature and with the substitution of Ho2O3 for Al2O3 or SiO2 in 0.1 N HCl. Both glass surface analysis by EDS and solution analysis by ICP showed that little if any holmium leached from bulk glass specimens or microspheres into the distilled water or saline solution at 37 or 70 °C. EDS and ICP also indicate that the predominant corrosion mechanism in 0.1N HCl is dependent on glass composition and temperature. The density, refractive index, thermal expansion, and Vickers hardness increased with Ho2O3 content. The structure of the glasses was examined by FTIR"--Abstract, page iv.

Advisor(s)

Day, D. E.

Committee Member(s)

Moore, Robert E., 1930-2003
Brown, Roger F.

Department(s)

Materials Science and Engineering

Degree Name

M.S. in Ceramic Engineering

Publisher

University of Missouri--Rolla

Publication Date

Fall 1992

Pagination

x, 58 pages

Note about bibliography

Includes bibliographical references (pages 27-28).

Rights

© 1992 Daniel Steven McIntyre, All rights reserved.

Document Type

Thesis - Restricted Access

File Type

text

Language

English

Thesis Number

T 6509

Print OCLC #

27857209

Electronic OCLC #

1082519890

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=b2385045~S5

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