Aging effects in supercooled silica
| Autor: | Ali Kerrache, D. Guichaoua, André Monteil, Victor Teboul |
|---|---|
| Rok vydání: | 2003 |
| Předmět: |
Silicon
chemistry.chemical_element Radial distribution Condensed Matter Physics Condensed Matter::Disordered Systems and Neural Networks Measure (mathematics) Oxygen Electronic Optical and Magnetic Materials Condensed Matter::Soft Condensed Matter Molecular dynamics Oxygen atom chemistry Chemical physics Materials Chemistry Ceramics and Composites Physical chemistry sense organs skin and connective tissue diseases Supercooling |
| Zdroj: | Journal of Non-Crystalline Solids. 322:41-45 |
| ISSN: | 0022-3093 |
| Popis: | Using molecular dynamics simulations we investigate the presence of dynamical heterogeneities in supercooled silica, a ‘strong’ glass former, and the changes as a function of time of these heterogeneities during aging. We compare the radial distribution functions for the 10% most mobile silicon or oxygen atoms with the corresponding mean radial distribution functions. We measure changes of these radial distribution functions and the changes of the non-gaussian parameters with time after a quench. We find that dynamical heterogeneities are present in silica and that they increase during the aging process. We find that the oxygen and silicon atoms show similar heterogeneities but with a differing rate of change during aging. |
| Databáze: | OpenAIRE |
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