Crystallization of amorphous silicates far from equilibrium part II: Experimental insight into the key role of decoupled cation mobilities
| Autor: | Pascal Roussel, Hugues Leroux, Frédéric Capet, Mathieu Roskosz, Jessy Gillot |
|---|---|
| Přispěvatelé: | Unité Matériaux et Transformations - UMR 8207 (UMET), Institut de Chimie du CNRS (INC)-Institut National de la Recherche Agronomique (INRA)-Centre National de la Recherche Scientifique (CNRS)-Université de Lille-Ecole Nationale Supérieure de Chimie de Lille (ENSCL), Unité de Catalyse et Chimie du Solide - UMR 8181 (UCCS), Centrale Lille Institut (CLIL)-Université d'Artois (UA)-Centrale Lille-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Lille, Institut National de la Recherche Agronomique (INRA)-Ecole Nationale Supérieure de Chimie de Lille (ENSCL)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Unité de Catalyse et de Chimie du Solide - UMR 8181 (UCCS), Université d'Artois (UA)-Ecole Centrale de Lille-Ecole Nationale Supérieure de Chimie de Lille (ENSCL)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université de Lille-Ecole Nationale Supérieure de Chimie de Lille (ENSCL)-Institut National de la Recherche Agronomique (INRA), Institut National de la Recherche Agronomique (INRA)-Ecole Nationale Supérieure de Chimie de Lille (ENSCL)-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Université d'Artois (UA)-Centrale Lille-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2011 |
| Předmět: |
010302 applied physics
Phase transition Materials science Nucleation Thermodynamics 02 engineering and technology [CHIM.INOR]Chemical Sciences/Inorganic chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Electronic Optical and Magnetic Materials law.invention Amorphous solid Crystal Crystallography Equilibrium thermodynamics law 0103 physical sciences Materials Chemistry Ceramics and Composites Crystallization 0210 nano-technology Glass transition ComputingMilieux_MISCELLANEOUS Phase diagram |
| Zdroj: | Journal of Non-Crystalline Solids Journal of Non-Crystalline Solids, Elsevier, 2011, 357 (19-20), pp.3467-3473. ⟨10.1016/j.jnoncrysol.2011.06.022⟩ Journal of Non-Crystalline Solids, 2011, 357 (19-20), pp.3467-3473. ⟨10.1016/j.jnoncrysol.2011.06.022⟩ |
| ISSN: | 0022-3093 |
| DOI: | 10.1016/j.jnoncrysol.2011.06.022⟩ |
| Popis: | The crystallization of amorphous and porous Ca–Mg-silicates prepared by a sol–gel method is studied in the glass transition range during isothermal and continuous heating experiments. A starting material of diopside (CaMgSi 2 O 6 ) composition was primarily studied because it is a reference system to study crystal nucleation and growth. The annealed products were characterized by X-ray diffraction and transmission electron microscopy. In the glass transition range, the crystallization is not congruent. It follows a systematic sequence in which the most Ca-rich silicates present in the phase diagram crystallize first. This trend does not obey equilibrium thermodynamics predictions. Instead, this sequence is the result of the decoupled mobilities of network-modifying and network-forming cations. The high surface/volume ratio of gels likely exacerbates this effect compared to compositionally comparable glasses. Altogether, the study shows that local dynamics controls kinetic phase transitions in the glass transition range. |
| Databáze: | OpenAIRE |
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