Journal
JOURNAL OF NON-CRYSTALLINE SOLIDS
Volume 377, Issue -, Pages 54-59Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jnoncrysol.2013.01.049
Keywords
Chalcogenide glasses; Elastic moduli; Structure; Glass transition
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Physical properties, including mechanical, thermal and optical properties, have been investigated for chalcogenide glasses in the GexSe1 - x system, for x ranging between 0 and 0.42. In the 0<1/3 range, the elastic moduli and the glass transition temperature (T-g) evolve as would be expected from the chain crossing model or from the clustering model. The change is continuous and there is no incidence of the rigidity percolation threshold (< r > = 2.4). Conversely, the chemical threshold (< r > = 2.67) clearly induces a change in the compositional trend of these properties. In the x > 1/3 range, T-g decreases and the elastic moduli markedly increase, which is not expected from the continuously reticulated model. The change of the physical properties in this range is an indicator of the existence of separated Ge-rich domains. (C) 2013 Elsevier B.V. All rights reserved.
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