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Abstract
The origin of the various manifestations of the mixed modifier effect in silicate glasses remains poorly understood. Here, based on molecular dynamics simulations, we investigate the origin of a negative deviation from linearity in the hardness of a series of mixed alkaline earth aluminosilicate glasses. The minimum of hardness is shown to arise from a maximum propensity for shear flow deformations in mixed compositions. We demonstrate that this anomalous behavior originates from the existence of local structural instabilities in mixed compositions arising from a mismatch between the modifiers and the rest of the silicate network. Overall, we suggest that the mixed modifier effect manifests itself as a competition between the thermodynamic driving force for structural relaxation and the kinetics thereof.
Originalsprog | Engelsk |
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Tidsskrift | Journal of Non-Crystalline Solids |
Vol/bind | 489 |
Sider (fra-til) | 16-21 |
Antal sider | 6 |
ISSN | 0022-3093 |
DOI | |
Status | Udgivet - 1 jun. 2018 |
Fingeraftryk
Dyk ned i forskningsemnerne om 'Hardness of Silicate Glasses: Atomic-Scale Origin of the Mixed Modifier Effect'. Sammen danner de et unikt fingeraftryk.Projekter
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Glass Mechanical Properties: Structural Origins and Engineering
Smedskjær, M. M. (PI (principal investigator)), Yue, Y. (PI (principal investigator)), Somers, M. A. J. (PI (principal investigator)), Januchta, K. (Projektdeltager) & To, T. (Projektdeltager)
01/10/2016 → 28/02/2021
Projekter: Projekt › Forskning