Crystallization of a highly viscous multicomponent silicate glass: Rigidity percolation and evidence of structural heterogeneity |
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| Affiliation: | 1. Institute für Mineralogie, Ruhr Universität Bochum, Universitätstrasse 150, 44801 Bochum, Germany;2. Materials Science Division, Bhabha Atomic Research Centre, Mumbai 400 085, India;3. RUBION, Ruhr Universität Bochum, D-44879 Bochum, Germany;1. Institut für Mineralogie, Leibniz Universität Hannover, Callinstr. 3, D-30167 Hannover, Germany;2. ZFM - Zentrum für Festkörperchemie und Neue Materialien, Callinstr. 3a, D-30167 Hannover, Germany;3. Department of Earth and Environmental Sciences, University of Michigan, 1100 North University Ave., Ann Arbor, MI 4810—1005, United States;1. 4MAT Department, CP165/63, Université Libre de Bruxelles, Avenue F. Roosevelt 50, B-1050 Brussels, Belgium;2. Dept. of Materials Science & Engineering, University of California at Davis, Davis, CA 95616, USA;3. Technovation Centre, AGC Glass Europe, Rue Louis Blériot 12, B-6041 Gosselies, Belgium;1. Physics of AmoRphous and Inorganic Solids Laboratory (PARISlab), University of California, Los Angeles, CA 90095, USA;2. Department of Chemistry and Bioscience, Aalborg University, Aalborg 9220, Denmark;3. Science and Technology Division, Corning Incorporated, Corning, NY 14831, USA;4. Institute of High Pressure Physics, Polish Academy of Sciences, Warsaw 00-142, Poland;1. Institute of Non-Metallic Materials, Clausthal University of Technology, Germany;2. Central Research and Development, Schott AG, Mainz, Germany |
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| Abstract: | A magnesium bearing multicomponent silicate glass was annealed at the temperature slightly above glass transition temperature (Tg) for various periods of time. The crystalline phase of fluorophlogopite with the chemical formula of NaMg3AlSi3O10F2 is precipitated in the floppy regions, which leads to the formation of a core-shell structure. Considering that there exists only four- or six-fold coordinated Mg2+ in the studied glass, the fraction of four-fold coordinated Mg2+ is determined by comparing the maximum size of the crystallite and the floppy region according to the percolation theory. In addition, a striking phenomenon of endotherm above glass transition in heat capacity (Cp) curve is observed for the first time when prolonging the annealing time, which is ascribed to the amorphous heterogeneous structure surrounding the crystallites. |
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| Keywords: | Silicate glass Crystallization Percolation theory Structural heterogeneity |
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