Title

On Glass Formation for a Na₂O4TeO₂ Melt: Effect of Melting Temperature, Time, and Raw Material

Abstract

The effect of melting temperature, time, and the type of raw material, NaNO3 or Na2CO3, as a source for Na2O on the glass formation for a Na2O·4TeO2(NT4) melt was investigated. Melting with NaNO3 at 750°C for a short time (15 min) produced a glass that is slightly more chemically durable and more resistant to crystallization than glasses melted at a higher temperature (800°C), or for a longer time (60 min), or using Na2CO3. A thin surface layer (<1.5 nm) that contains some nitrogen and a higher concentration of bridging oxygen is suspected to be the reason for the higher chemical durability and higher resistance to crystallization for this glass. However, melting at 800°C for 60 min produced a glass, whose properties were independent of the type of raw material, NaNO3 or Na2CO3, used.

Department(s)

Materials Science and Engineering

Sponsor(s)

United States. National Aeronautics and Space Administration

Keywords and Phrases

Raman Spectra; Tellurite Glasses; Tellurium Oxide (TeO2)

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2004 Springer Verlag, All rights reserved.

Share

 
COinS