By Rong Ping Wang
This publication presents a entire assessment of the chalcogenide glass technology and diverse purposes in response to the glasses. It starts off with a assessment at the glass-forming skill of assorted platforms, by way of a dialogue at the structural and actual homes of assorted chalcolgenide glasses and their software in built-in optics. The chapters were contributed by way of widespread specialists from everywhere the international, and hence, the e-book provides the hot examine advances within the sector. This ebook will attract someone who's curious about glass technological know-how and expertise and glass applicati. Read more...
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Extra info for Amorphous Chalcogenides: Advances and Applications
Nonideal Systems While Ge–Se and Ge–As–Se glasses behave ideally and visibly exhibit structural eﬀects associated with the rigidity percolation threshold, other systems may signiϐicantly deviate from ideality and exhibit diverging behaviors. This divergence may be due to a large mismatch in atomic radius, low covalency, or ionic character of constituent elements or a difϐiculty in clearly assigning the valence of elements such as Ga or Pb. Another common source of divergence in well-deϐined covalent systems is the structural/chemical eﬀects associated with the stoichiometry of the glass formers, which can occur in a composition range that overlaps the rigidity transition [54, 68].
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.
Molecular liquids such as salol whose structural integrity relies primarily on weak van der Waals interactions tend to collapse easily with temperature and typically exhibit the most fragile behaviors (Fig. 3). On the other end, covalent networks such as silica remain connected at higher temperatures and exhibit strong behaviors. 2 Tg-scaled viscosity–temperature plots of glass-forming liquids covering a wide range of fragility. Liquids following Arrhenius behavior are “strong,” while non-Arrhenius liquids are fragile.