Striking role of non-bridging oxygen on glass transition temperature of calcium aluminosilicate glass-formers Journal: Journal of Chemical Physics - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Chemical Physics Année : 2014

Striking role of non-bridging oxygen on glass transition temperature of calcium aluminosilicate glass-formers Journal: Journal of Chemical Physics

Résumé

Molecular dynamics simulations are used to study the structural and dynamic properties of calcium aluminosilicate, (CaO-Al2O3)(1-x)(SiO2)(x), glass formers along three joins, namely, R = 1, 1.57, and 3, in which the silica content x can vary from 0 to 1. For all compositions, we determined the glass-transition temperature, the abundances of the non-bridging oxygen, triclusters, and AlO5 structural units, as well as the fragility from the temperature evolution of the alpha-relaxation times. We clearly evidence the role played by the non-bridging oxygen linked either to Al atoms or Si atoms in the evolution of the glass-transition temperature as well as of the fragility as a function of silica content along the three joins. (C) 2014 AIP Publishing LLC.

Domaines

Matériaux
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Dates et versions

hal-01071865 , version 1 (06-10-2014)

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M. Bouhadja, N. Jakse, A. Pasturel. Striking role of non-bridging oxygen on glass transition temperature of calcium aluminosilicate glass-formers Journal: Journal of Chemical Physics. Journal of Chemical Physics, 2014, 140 (23), pp.7. ⟨10.1063/1.4882283⟩. ⟨hal-01071865⟩
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