Heterogeneous bulk nucleation and differential thermal analysis |
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Authors: | A Marotta A Buri F Branda |
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Institution: | (1) Istituto di Chimica, Facoltà di Ingegneria, Università di Napoli, Napoli, Italy |
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Abstract: | The effect of the addition of Ag2O on the mechanism of non-isothermal devitrification of Li2O · 2 SiO2 glass has been studied by differential thermal analysis. In both bulk and powdered samples, the presence of heterogeneous nuclei lowers the crystallization temperatures but not the value of the crystal growth activation energy.The influence of the catalyst on the crystallization mechanism is not affected by a pre vious heat treatment at the temperature of the maximum nucleation rate.
Zusammenfassung Die Wirkung des Einflusses von Ag2O auf den nicht-isothermen Entglasungsmechanismus von Li2O · 2 SiO2-Glas wurde durch Differentialthermoanalyse untersucht.Die Gegenwart heterogener Kerne setzt die Kristallisierungstemperaturen herab, jedoch nicht die Werte der Aktivierungsenergien des Kristallwachstums in grob- als auch in feinpulverisierten Proben.Die Wirkung des Katalysators auf den Kristallisationsmechanismus wird durch eine vorhergehende Wärmebehandlung bei der Temperatur der maximalen Keimbildungsgeschwindigkeit nicht beeinflusst.
Résumé On a étudié, par analyse thermique différentielle, l'effet de l'addition d'Ag2O sur le mécanisme de dévitrification non-isotherme du verre Li2O · 2 SiO2. La présence de noyaux hétérogènes abaisse les températures de cristallisation, mais pas la valeur de l'énergie d'activation de la croissance des cristaux, que les échantillons soient massifs ou pulvérisés.L'influence du catalyseur sur le mécanisme de la cristallisation n'est pas altérée par un traitement thermique préalable à la température de la vitesse maximale de nucléation.
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