By Rong Ping Wang

This e-book offers a complete review of the chalcogenide glass technological know-how and diverse functions in accordance with the glasses. It starts off with a assessment at the glass-forming skill of assorted platforms, by means of a dialogue at the structural and actual houses of assorted chalcolgenide glasses and their software in built-in optics. The chapters were contributed through well known specialists from in all places the Read more...

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Extra resources for Amorphous Chalcogenides: Advances and Applications

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As shown in Fig. 3, the kinetic fragility is strictly deϐined from viscosity data; hence the Ea parameter in Eq. 3) should be the activation energy for viscous ϐlow Eη. However, it can be shown that the activation energy for enthalpy relaxation, EH, is strongly correlated to the activation energy for viscous ϐlow, Eη, and in most cases EH can be substituted for Eη in 27 28 Relaxation and Fragility in Chalcogenide Network Glasses Eq. 3) without introducing a large error in the determination of m.

These layers are connected to each other through van der Waals interactions that can rapidly collapse at the glass transition, thereby leading to a fragile behavior. At low average coordination, the glass is composed of long one-dimensional chains that also adopt a fragile behavior, while at high values As-rich zero-dimensional cage molecules precipitate out of the network, also leading to increased fragility. This structural evolution has indeed been well characterized spectroscopically [43, 54].

These properties range from density and thermal expansion to glass-forming ability [11, 16, 44]. For example, Fig. 2 shows the density and liquid thermal expansion versus for the binary Ge–Se and ternary Ge–Sb–Se systems. 4. 2 (a) Density as a function of for the binary Ge–Se (squares) and the ternary Ge–Sb–Se (triangles) (adapted from [44]). (b) Liquid-state thermal expansion coefϐicient αL as a function of for the binary Ge–Se (squares) and the ternary Ge–Sb–Se (triangles) (adapted from [16]).

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