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Proceedings Paper

Optical absorption and thermal expansion of semiconductor glasses As-S-Ge by topological transition
Author(s): D. Tsiulyanu; N. Gumenyuk; S. Marian
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Paper Abstract

The effect of mean coordination number r on the optical absorption in the region of exponential tail and on the thermal expansion of chalcogenide glasses As-S-Ge are presented. Several important parameters such as optical gap, disorder energy, coefficient of the temperature expansion and their variation with composition have been found. These parameters are shown to be strongly influenced by average coordination number, especially in the region of topological transitions. It is significant that all these parameters exhibit maximums at r approximately equal to 2.7. The explanation is put forward in light of a model which predicts the transformation of the glassy network from two- to three- dimensional configuration at r approximately equal to 2.7. The correlation between optical gap (i.e. intrinsic absorption) and thermal expansion of the glasses shows the possibilities of absorption spectroscopy for testing the properties of non-crystalline materials including the thermo-mechanical ones.

Paper Details

Date Published: 3 November 1995
PDF: 7 pages
Proc. SPIE 2648, International Conference on Optical Diagnostics of Materials and Devices for Opto-, Micro-, and Quantum Electronics, (3 November 1995); doi: 10.1117/12.226198
Show Author Affiliations
D. Tsiulyanu, Technical Univ. (Moldova)
N. Gumenyuk, Technical Univ. (Moldova)
S. Marian, Technical Univ. (Moldova)


Published in SPIE Proceedings Vol. 2648:
International Conference on Optical Diagnostics of Materials and Devices for Opto-, Micro-, and Quantum Electronics
Sergey V. Svechnikov; Mikhail Ya. Valakh, Editor(s)

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