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Amorphous Chalcogenides: Advances and Applications by Rong Ping Wang

By Rong Ping Wang

This publication presents a finished evaluation of the chalcogenide glass technology and diverse functions in accordance with the glasses. It starts off with a overview at the glass-forming skill of assorted platforms, by means of a dialogue at the structural and actual houses of varied chalcolgenide glasses and their program in built-in optics. The chapters were contributed by means of favorite specialists from in every single place the Read more...

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The behavior of these two systems therefore emphasizes the role of network dimensionality in controlling glass formers’ fragility and its potentially competing effect with structural rigidity. 9 Dependence of the fragility index, m, on the average coordination for As–Se and As–S glasses (data from [54] and [68], respectively). 33 34 Relaxation and Fragility in Chalcogenide Network Glasses Despite the presence of competing structural effects such as network dimensionality, the general trend shown in Figs.

2 Average Coordination and Rigidity Percolation The component elements of chalcogenide glasses all have a relatively similar electronegativity close to Χ = 2 and consequently form welldeϐined directional covalent bonds following the 8-N rule. The glass structure can then be effectively described as a network of covalent bonds that lends itself well to constraint-counting algorithms for modeling and simulations. For example, the number of topological constraints within a network can be accurately determine by considering that rigid bonds between two atoms each generate one bonding constraint and ϐixed bond angles between three atoms each 21 22 Relaxation and Fragility in Chalcogenide Network Glasses generate one angular constraint.

11b using glasses from the Ge–Se system. Two glass formers of opposite fragility [22] were annealed to saturation at a temperature slightly below the glass transition, where the relaxation time is still within reasonable experimental range [35]. 11b clearly shows that the fragile glass GeSe9 has a far larger propensity for relaxation, which also increases at a faster rate than that of the strong glass GeSe4. Note the qualitative similarity between the experimental data points of Fig. 11b and the model plots of Fig.

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