Structural properties of alkali—borate glasses derived from a theoretical model
| Autor: | Jean-Paul Duruisseau, Richard Kerner, Rafael A. Barrio |
|---|---|
| Rok vydání: | 1995 |
| Předmět: |
Chemistry
Differential equation General Chemical Engineering Configuration entropy General Physics and Astronomy Thermodynamics Binary number chemistry.chemical_element Alkali metal Condensed Matter::Disordered Systems and Neural Networks Amorphous solid Physical chemistry Boron Chemical composition Physical quantity |
| Zdroj: | Philosophical Magazine B. 72:535-550 |
| ISSN: | 1463-6417 1364-2812 |
| Popis: | A model for studying the growth of amorphous solids with medium range order is applied to the binary borate glasses (1–c) B2O3–cLi2O.'The dynamics of growth is represented by a set of nonlinear differential equations and the amorphous state is associated with the solution with maximum configurational entropy. The analysis of the structure of the amorphous state obtained allows predictions to be made concerning the relative concentration of various local configurations involving four-coordinated boron atoms, and these are compared with experimental data. When one fixes the concentration c, new solutions are found in a finite range of temperatures around the glass-transition temperature. This model predicts structural changes that occur when one anneals the glasses at different temperatures. Changes in other physical quantities when one varies c can also be predicted from this model. |
| Databáze: | OpenAIRE |
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