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Vitrification, crystallization behavior and structure of zinc aluminosilicate glasses

Abstract : The glass formation, crystallization behavior and structure were investigated in the ZnO-Al2O3-SiO2 system. The boundaries of the glass forming region are defined, indicating the absence of glasses along the ZnO-SiO2 binary and the role of Al to improve glass formation. The crystallization behavior has been clarified for representative glass compositions showing first crystallization of willemite near the ZnO-SiO2 binary and a metastable zinc aluminosilicate solid solution for higher Al2O3/SiO2 content. Gahnite appears as a second phase and is mainly present near the center of the tectosilicate join. Glass structure was studied using 27 Al NMR spectroscopy, neutron and X-ray diffraction and molecular dynamics simulation. Both Al and Zn are shown to be distributed between four-fold and five-fold sites. The proportion of [4] Al is more important near the ZnAl2O4-SiO2 join. A remarkable similar behavior is revealed for the glass forming ability and structural properties between MgO and ZnO aluminosilicate systems.
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https://hal.archives-ouvertes.fr/hal-03168161
Contributor : Laurent Cormier <>
Submitted on : Friday, March 12, 2021 - 5:18:35 PM
Last modification on : Tuesday, March 16, 2021 - 3:31:49 AM

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Laurent Cormier, Ludovic Delbes, Benoit Baptiste, Valérie Montouillout. Vitrification, crystallization behavior and structure of zinc aluminosilicate glasses. Journal of Non-Crystalline Solids, Elsevier, 2021, 555, pp.120609. ⟨10.1016/j.jnoncrysol.2020.120609⟩. ⟨hal-03168161⟩

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