On Glass Formation for a Na₂O4TeO₂ Melt: Effect of Melting Temperature, Time, and Raw Material
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.
D. Zhu et al., "On Glass Formation for a Na₂O4TeO₂ Melt: Effect of Melting Temperature, Time, and Raw Material," Journal of Materials Science, Springer Verlag, Dec 2004.
The definitive version is available at http://dx.doi.org/10.1023/B:JMSC.0000048750.50187.72
Materials Science and Engineering
United States. National Aeronautics and Space Administration
Keywords and Phrases
Raman Spectra; Tellurite Glasses; Tellurium Oxide (TeO2)
Article - Journal
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