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Elastic and structural properties of low silica calcium aluminosilicate glasses from molecular dynamics simulations

Version 2 2024-06-06, 10:39
Version 1 2019-09-17, 11:36
journal contribution
posted on 2024-06-06, 10:39 authored by H Jabraoui, M Badawi, S Lebègue, Y Vaills
© 2018 Elsevier B.V. The elastic constants and the structural of low silica calcium aluminosilicate glasses with a low content of silica (5–25 mol%) and [CaO]/[Al2O3] =2, are investigated using molecular dynamics simulations. In particular, their elastic constants are calculated using two methods: a standard approach at zero temperature and another method designed to work at finite temperature. We show that while they both reproduce qualitatively the experimental behavior, only the method taking temperature into account provides a quantitative agreement with the experimental values. Therefore, taking temperature into account in the determination of elastic constants seems necessary to give a satisfactory account of the mechanical properties of these materials. In accordance with the experimental results, our molecular dynamics calculations show values of elastic constants that decrease with increasing amount of silica in the vitreous network. Then, the structure of the glasses is analyzed in term of pair distribution functions, oxygen kinds, and the parameter of short-range order, and discussed in correlation with the available experimental data. An overall good agreement is obtained with the calculated structure and the experimental data.

History

Journal

Journal of Non-Crystalline Solids

Volume

499

Pagination

142-152

Location

Piscataway, N.J.

ISSN

0022-3093

Publication classification

C1 Refereed article in a scholarly journal

Publisher

Elsevier