caa a22 4500 463189868 CHVBK 20180406164905.0 cr unu---uuuuu 170326e20071201xx s 000 0 eng 10.1007/s10973-006-7888-4 doi (NATIONALLICENCE)springer-10.1007/s10973-006-7888-4 Dehydroxylation kinetic and exfoliation of large muscovite flakes [Elektronische Daten] [F. Gridi-Bennadji, P. Blanchart] The thermal transformations of muscovite flakes are a key point in many applications because besides dehydroxylation a significant exfoliation process occurs. Dehydroxylation kinetic is experimented by isothermal TG analyses in the 700-850°C temperature range and described with the Avrami theory. Hydroxyl condensation predominates at the onset of the process, but water diffusion is the most important process when the transformed fraction is high. The progressive transition between the two transformation stages contrast with the more accentuated transition for a ground muscovite. The activation energy varies weakly (190-214 kJ mol−1) in the whole transformation process that supports the co-existence of hydroxyl condensation and diffusion phenomena. Dehydroxylation kinetic increases strongly with temperature and decreases with the reaction advancement. Exfoliation is correlated with dehydroxylation kinetic and occurs in a narrow transformation and temperature ranges. An in-situ combination process of hydroxyls occurs and water vapor favors the layer expansion. Springer Science+Business Media LLC, 2007 dehydroxylation nationallicence exfoliation nationallicence flakes nationallicence muscovite nationallicence Gridi-Bennadji F. GEMH, Ecole Nationale Supérieure de Céramique Industrielle, Limoges, France aut Blanchart P. GEMH, Ecole Nationale Supérieure de Céramique Industrielle, Limoges, France aut Journal of Thermal Analysis and Calorimetry Springer US; http://www.springer-ny.com 90/3(2007-12-01), 747-753 1388-6150 90:3<747 2007 90 10973 https://doi.org/10.1007/s10973-006-7888-4 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10973-006-7888-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Gridi-Bennadji F. GEMH, Ecole Nationale Supérieure de Céramique Industrielle, Limoges, France aut NATIONALLICENCE 700 1- Blanchart P. GEMH, Ecole Nationale Supérieure de Céramique Industrielle, Limoges, France aut NATIONALLICENCE 773 0- Journal of Thermal Analysis and Calorimetry Springer US; http://www.springer-ny.com 90/3(2007-12-01), 747-753 1388-6150 90:3<747 2007 90 10973 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer