Masters Theses

Keywords and Phrases

Low melting temperature

Abstract

"The main objective of this research was to evaluate the properties and structures of glasses from the stannous (SnO) phosphate system for possible use in low temperature optical applications. Glasses in the binary xSnO-(100-x)P₂O₅ system (50 ≤ x ≤ 70) were prepared and their thermal and optical properties were evaluated. Differences in glass transition temperatures (Tg) measured here and reported in the literature were explained by differences in the residual water content in the glasses, as determined by infrared spectroscopy. In general, increasing the SnO content of the binary glasses increased the refractive index and the glass transition temperature, and reduced the residual water content, producing glasses that are more chemically stable. Raman spectroscopy showed that the chain-length of the average phosphate anion decreased with increasing SnO content. The addition of B₂O₃ to a Sn(II)-pyrophosphate base glass (x= 67) improves the aqueous dissolution rate by an order of magnitude. The impact of these compositional changes on the optical and thermal properties depends on how the borate is added. Raman and nuclear magnetic resonance spectroscopies reveal that boron is initially incorporated into the glass network in tetrahedral sites and the pyrophosphate anions are converted to orthophosphate anions. The effects of the addition of Ga₂O₃ and Sb₂O₃ on the properties of the tin phosphate glasses were also determined. In general, the addition of these modifying oxides increase the glass transition temperature from around 250⁰C to 350⁰C, and the refractive index (nD) was in the range 1.75-1.85, depending on glass composition. The chemical durability of these modified glasses was similar to those modified by B₂O₃-additions. Raman spectroscopy revealed the formation of isolated orthophosphate anions in the formation of Ga (Sb)-O-P glass networks"--Abstract, page iv.

Advisor(s)

Brow, Richard K.

Committee Member(s)

OKeefe, Matt
Day, D. E.

Department(s)

Materials Science and Engineering

Degree Name

M.S. in Ceramic Engineering

Sponsor(s)

Government of the Republic of China

Publisher

Missouri University of Science and Technology

Publication Date

Fall 2010

Journal article titles appearing in thesis/dissertation

  • Properties and structure of binary tin phosphate glasses
  • Properties and structure of tin borophosphate glasses
  • Properties and structure of tin phosphate glasses modified with GaO and SbO

Pagination

xi, 83 pages

Rights

© 2010 Jong Wook (Austin) Lim, All rights reserved.

Document Type

Thesis - Open Access

File Type

text

Language

English

Library of Congress Subject Headings

Glass-ceramics
Low temperatures
Optical materials
Phosphates

Thesis Number

T 9737

Print OCLC #

731974339

Electronic OCLC #

748403037

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