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Amorphous Chalcogenides: Advances and Applications by Rong Ping Wang

By Rong Ping Wang

This e-book presents a finished review of the chalcogenide glass technological know-how and numerous functions in response to the glasses. It begins with a evaluate at the glass-forming skill of varied structures, via a dialogue at the structural and actual houses of assorted chalcolgenide glasses and their software in built-in optics. The chapters were contributed through sought after specialists from in every single place the Read more...

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This process was subsequently observed by Golovchak in several other chalcogenide glasses, including As–S, As–Se, and Ge–Se [38, 39, 83]. The mechanism of gamma ray relaxation appears to be somewhat similar to that of photorelaxation by sub-bandgap light, and several patterns appear to be identical in both processes [38, 40]. In particular, gamma rays tend to accelerate physical aging in the same way as sub-bandgap light does. An example of gamma ray relaxation is depicted in Fig. 18 for a series of As–Se glasses irradiated with a 60Co source of a few Gy/s [38].

Hence, EH remains a useful parameter to investigate the correlation between fragility and mean coordination. 4 Other Fragility Measures The fragility of glass-forming liquids largely controls the features of the heat capacity jump throughout the glass transition. The shape of the glass transition can therefore be analyzed to provide an estimate of the fragility. Fragile systems tend to undergo large gains in degrees of freedom during the glass transition, which translate into large jumps in heat capacity within a short temperature range.

However, it has been shown that it is possible to lift the kinetic barrier to relaxation using optical stimulation with sub-bandgap light [22, 34, 35, 73]. The use of subbandgap light permits to excite band-tail states, while irradiating the glass within the transparency window. This effectively permits to generate photoinduced structural rearrangements within the bulk Relaxation Induced by Light of the glass, thereby leading to bulk effects such as photoϐluidity or photorelaxation [31, 32, 74]. For example chalcogenide glasses can undergo macroscopic plastic deformations when irradiated under an applied mechanical stress [31, 32].

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