Amorphous Chalcogenides: Advances and Applications by Rong Ping Wang

By Rong Ping Wang

This ebook offers a finished evaluate of the chalcogenide glass technological know-how and numerous purposes in keeping with the glasses. It starts off with a evaluation at the glass-forming skill of varied structures, via a dialogue at the structural and actual homes of assorted chalcolgenide glasses and their program in built-in optics. The chapters were contributed via admired specialists from in all places the Read more...

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The trends for both systems show a clear minimum in fragility at the rigidity percolation threshold. 7 Dependence of the fragility index, m, on the average coordination for Ge–Se and Ge–As–Se glasses. The fragility index was derived from the activation energy for enthalpy relaxation measured by DSC using Moynihan’s method. The same trends can be observed using other measures of fragility, including ΔCp and ΔTg/Tg. Note that ΔCp can be used 31 32 Relaxation and Fragility in Chalcogenide Network Glasses without normalization for the purpose of observing trends within a given system.

From Eq. 3) it is shown that strong glasses have low ΔH* values and should consequently have shorter relaxation times. The corollary is that fragile systems have comparatively longer relaxation times, although they can relax more extensively. Of course, Tg also strongly affects the relaxation time through A at a given temperature T. For example, high Tg glasses will tend to have extremely long relaxation times at room temperature. Hence, the kinetics of relaxation processes at room temperature is a complex function of , which depends on both Tg and fragility.

Development of far-infrared-transmitting Te based glasses suitable for carbon dioxide detection and space optics. Adv. Mater. ), 19, 3796–3800 (2007). 9 Zhang X. , Production of complex chalcogenide glass optics by molding for thermal imaging. J. Non-Cryst. Solids, 326, 327, 519–523 (2003). 10 Thorpe M. , Continuous deformations in random networks. J. NonCryst. Solids, 57, 355–370 (1983). 11 Phillips J. , Topology of covalent non-crystalline solids. I. Short-range order in chalcogenide alloys.

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