Download PDF by Rong Ping Wang: Amorphous Chalcogenides: Advances and Applications

By Rong Ping Wang

ISBN-10: 9814411299

ISBN-13: 9789814411295

ISBN-10: 9814411302

ISBN-13: 9789814411301

This e-book offers a accomplished review of the chalcogenide glass technological know-how and numerous functions in accordance with the glasses. It starts off with a evaluate at the glass-forming skill of assorted platforms, by means of a dialogue at the structural and actual homes of varied chalcolgenide glasses and their software in built-in optics. The chapters were contributed by way of widespread specialists from in every single place the Read more...

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Rigid glasses with high structural coordination require higher photon ϐlux before deformation can be observed, while ϐloppy networks with open structures and steric freedom can undergo effective rearrangements at lower photon ϐlux. The intensity dependence of the photoinduced ϐluidity can be accurately predicted using a simple model accounting for these principles [32]. ” 39 40 Relaxation and Fragility in Chalcogenide Network Glasses Increased structural mobility enables the structure to reach a more energetically favorable conϐiguration and allows the glass to progress toward thermodynamic equilibrium.

The activation energy for viscous ϐlow, Eη, was obtained by indentation tests on mirror-polished samples [59], and the activation energy for enthalpy relaxation, EH, was obtained by the cool rate method using high-resolution DSC [60]. 5 shows that the m parameters calculated using these two methods agree within ~5%. These results conϐirm that EH can be reliably used to estimate m for chalcogenide glasses. These data are also in reasonable agreement with m parameters obtained by Musgraves et al.

These methods speciϐically 29 30 Relaxation and Fragility in Chalcogenide Network Glasses apply to chalcogenide glasses and can therefore provide a useful means of studying the effect of average coordination on the physical properties of amorphous networks, as will be shown in the next section. It must be noted that while DSC is a straightforward and widely available technique, much care must be taken during sample preparation and data analysis in order to obtain reliable results [60]. 6 (a) Correlation between the heat capacity jump to the melting point ratio ΔCp/ΔSm and the fragility index, m, obtained from viscosity data for 53 nonpolymeric glass-forming materials (reproduced from [62]).

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Amorphous Chalcogenides: Advances and Applications by Rong Ping Wang

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