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Devitrification of Nd3+-doped glasses in the akermanite-gehlenite system

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Abstract

The devitrification of glasses in the akermanite-gehlenite system [(C2Al2−2yMgySi1+yO7 (0≤y≤1)] doped with Nd3+ (2% mol) has been studied. DTA was used to determine the kinetics of the process. The Avrami law α=1-exp(−kt n) withn=1 was found to hold for doped gehlenite. For pure gehlenite, parametern was determined to be 1.5. The activation energy of the devitrification process is independent of the presence of neodymium, and it is of the same order of magnitude as that for the viscous flow in molten silicates (ca. 650–750 kJ·mol−1).

Zusammenfassung

Es wurde die Entglasung von Gläsern in dem mit Nd3+ (2 mol%) versetzten Akermanit-Gehlenit-System [C2Al2−2yMgySi1+y (0<y≤1)] untersucht. DTA wurde zur Bestimmung der Kinetik des Prozesses eingesetzt. Für versetztes Gehlenit fand man ein Zutreffen der Avrami'schen Regel α=1-exp(−kt n). Für reines Gehlenit erhielt man für den Parametern einen Wert von 1,5. Die Aktivierungsenergie des Entglasungsprozesses ist unabhängig von der Gegenwart von Neodym und hat die gleiche Größenordnung wie für den viskosen Fluß in geschmolzenen Silikaten (ca. 650–750 kJ/mol).

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Author notes

  1. A. Małecki

    Present address: Faculty of Materials Science and Ceramics, University of Mining and Metallurgy, Al. Mickiewicza 30, 30-059, Cracow, Poland

Authors and Affiliations

  1. Ecole Nationale Supérieure de Chimie de Paris, 11, Rue Pierre et Maire Curie, 75231, Paris, France

    A. Małecki, A. M. Lejus, B. Viana, D. Vivien & R. Collongues

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  1. A. Małecki
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  2. A. M. Lejus
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  3. B. Viana
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  4. D. Vivien
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  5. R. Collongues
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Małecki, A., Lejus, A.M., Viana, B. et al. Devitrification of Nd3+-doped glasses in the akermanite-gehlenite system. Journal of Thermal Analysis 44, 461–472 (1995). https://doi.org/10.1007/BF02636136

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  • DOI: https://doi.org/10.1007/BF02636136

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