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Published on: September 17, 2021
Thermodynamic and structural properties of binary calcium silicate glasses: insights from molecular dynamics
H Jabraoui1, M Malki2, A Hasnaoui3
1Laboratoire de Chimie et Physique - Approche Multi-Echelle des Milieux Complexes (LCP-A2MC, EA4632), Institut Jean Barriol FR2843 CNRS, Université de Lorraine, Rue Victor Demange, 57500 Saint-Avold, France. Hicham.jabraoui@univ-lorraine.fr and Laboratoire de Cristallographie, Résonance Magnétique et Modélisations (CRM2, UMR CNRS 7036), Institut Jean Barriol, Université de Lorraine, BP 239, Boulevard des Aiguillettes, 54506 Vandœuvre-lès-Nancy-Cedex, France.
Abstract:
We study calcium silicate glass of composition (CaO)X(SiO2)(1-X), where X = 40-70 mol%, by means of molecular dynamics for different cooling rates between 1011-1013 K s-1. The thermodynamic and kinetic properties of calcium silicate materials are determined, discussed, and correlated to local structures at short and intermediate range orders and to the potential energies of the oxygen atoms. We show that the amount of non-bridging oxygens and the appearance of free oxygens are related to the increase of the glass transition temperature for an increasing CaO content. Our results are analyzed and discussed in connection with the available experimental data.
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