Download Amorphous Chalcogenides: Advances and Applications by Rong Ping Wang PDF

By Rong Ping Wang

This publication presents a accomplished evaluation of the chalcogenide glass technological know-how and numerous functions in accordance with the glasses. It begins with a evaluation at the glass-forming skill of assorted platforms, by way of a dialogue at the structural and actual homes of varied chalcolgenide glasses and their program in built-in optics. The chapters were contributed via famous specialists from in every single place the Read more...

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Extra info for Amorphous Chalcogenides: Advances and Applications

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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]. This behavior is reminiscent of the drop in photoϐluidity observed in rigid glasses [32]. The reason for this dependency is schematically illustrated in Fig. 17. Floppy networks having fewer constraints than degrees of freedom tend to undergo easy deformation at low energy cost called zero- 41 42 Relaxation and Fragility in Chalcogenide Network Glasses frequency modes [42].

In addition to controlling the magnitude of structural relaxation, fragility also affects the kinetics of the relaxation process. 4) Structural Relaxation in Relation to Fragility and Mean Coordination where τ is the structural relaxation time, A is a constant, x is the nonlinearity parameter, R is the gas law constant, and ΔH* is the activation energy for enthalpy relaxation (previously denoted by EH). From Eq. 3) it is shown that strong glasses have low ΔH* values and should consequently have shorter relaxation times.

On the other end, strong systems retain high viscosity over wider temperature ranges and exhibit shallower heat capacity gains spread out in temperature. The width and height of the glass transition, ΔTg and ΔCp, respectively, are therefore also commonly used as a measure of fragility [51, 62, 63]. The difference in heat capacity between the solid and the liquid can be conveniently measured by DSC to obtain ΔCp. To account for variations in the entropy of the corresponding crystalline phase, ΔCp is normalized by the melting entropy ΔSm.

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