By Rong Ping Wang
This e-book offers a accomplished evaluation of the chalcogenide glass technology and numerous functions in accordance with the glasses. It begins with a evaluation at the glass-forming skill of assorted structures, by way of a dialogue at the structural and actual homes of varied chalcolgenide glasses and their software in built-in optics. The chapters were contributed by way of fashionable specialists from everywhere the Read more...
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Extra resources for Amorphous Chalcogenides: Advances and Applications
Sample text
It must be emphasized that this process is fully athermal and takes place entirely at room temperature [31, 75, 76]. It should also be noted that the glass does not fully relax down to the thermodynamic equilibrium enthalpy state but rather reaches an intermediary photosaturated state corresponding to a dynamic equilibrium between photoexcitation and thermodynamically driven relaxation [34, 35]. 3 Effect of Structural Rigidity As mentioned above, ϐloppy networks tend to undergo more extensive photostructural changes due to their lower number of structural constraints.
4. 2 Dependence of the fragility measures ΔCp and ΔTg/Tg on the average coordination
Floppy networks are expected to have a large driving force for structural relaxation, combined with high photosensitivity, and consequently exhibit extensive photorelaxation. Rigid networks also show a large propensity for thermal relaxation but instead show no measurable photorelaxation when irradiated with an intensity of 3 W/cm2. In fact, the minimum intensity required to initiate photostructural changes in rigid glasses is notably higher and appears to be directly correlated to network connectivity [33].