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Influence of Amorphous Phase Separation on the crystallization mechanisms in the BaO-TiO2-SiO2 system

par Boulay, Emilie ;Godet, Stéphane
Référence Euromat (2011: Montpellier, France)
Publication Non publié, 2011

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Résumé :

The control of microstructures is a major challenge to enhance the properties of base glasses. More specifically, the controlled crystallization of glasses through a Prior Amorphous Phase Separation (APS) may be an elegant way to ensure a bulk process. Glasses in the BaO-TiO2-SiO2 system undergo APS for specific composition ranges. The interfaces created can have a significant effect on the crystallization behavior since it allows bulk nucleation of fresnoite to be obtained, instead of surface crystallization. This phenomenon can enhance optical properties such as blue photoluminescence, particularly interesting for plasma screen applications. The aim of this work is to compare the crystallization behavior with and without prior APS. The microstructures were investigated using Scanning and Transmission Electron Microscopy (SEM & TEM). Differential Scanning Calorimetry (DSC) and X-Ray Diffraction (DRX) were also used to characterize the crystallization process. The prior APS is shown to have a major influence for the glass compositions investigated Consequently, a modeling effort is presently being carried out in order to determine the immiscibility region, in order to compare compositions closer to the immiscibility boundary.