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Structural and vibrational investigations of thermal properties of tellurite glasses

Published online by Cambridge University Press:  29 June 2016

Raouf El-Mallawany
Raouf El-Mallawany*
Affiliation:
Physics Department, Faculty of Science, El-monofia University, Egypt
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Abstract

To obtain quantitative details about the structure of binary tellurite glasses, the thermal properties have been measured. The thermal properties (linear thermal expansion coefficient α and transformation temperature Tg) of a set of tellurite glasses containing rare earth oxides in the form (TeO2)0.9 (AnOm)0.1 have been measured. The vitreous systems containing the rare earth cations are La, Ce, and Sm. The coefficient of thermal expansion in the range of 300–500 K and the transformation temperatures were determined to detect local structural changes that might be induced by the modifiers. The thermal properties α and Tg are discussed in terms of (i) structure, by calculating the volume of structure unit, the average crosslink density, and the average stretching force constant of each glass system; (ii) vibrations, by correlating the mean long wavelength acoustic mode Griineisen parameter γel and the expansion coefficient α.

Type
Articles
Information
Journal of Materials Research , Volume 7 , Issue 1 , January 1992 , pp. 224 - 228
Copyright
Copyright © Materials Research Society 1992

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References

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