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

A. Małecki; A. Lejus; B. Viana; D. Vivien; R. Collongues

doi:10.1007/bf02636136

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Journal of Thermal Analysis and Calorimetry

Volume/Issue:: Volume 44: Issue 2

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

Authors: A. Małecki¹, A. Lejus¹, B. Viana¹, D. Vivien¹, and R. Collongues¹

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¹ Ecole Nationale Supérieure de Chimie de Paris 11, Rue Pierre et Maire Curie 75231 Paris France
² University of Mining and Metallurgy Faculty of Materials Science and Ceramics Al. Mickiewicza 30 30-059 Cracow Poland

DOI:: https://doi.org/10.1007/bf02636136

Page Count:: 461–472

Publication Date:: 01 Feb 1995

Online Publication Date:: 06 Jul 2007

Article Category:: Research Article

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Abstract

The devitrification of glasses in the akermanite-gehlenite system [(C₂Al_2−2yMg_ySi_1+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(−ktⁿ) 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).