Glass - Back to the Future!

Presenting Author:
Corinne Claireaux

article posted 16 May 2016

Corinne Claireaux Glass became her favourite material and research subject while working on bioglasses during an internship in Åbo University, Turku, Finland in 2010. In 2011, she graduated from Rennes engineering school of chemistry (ENSCR) and obtained a Master’s degree in solid state chemistry and materials from Rennes University, France. She did her PhD in the joint unit between the French national research centre (CNRS) and Saint-Gobain Recherche under the supervision of glass chemists and mineralogists. She studied the atomic mobility in alumino-silicate glasses, which required a lot of experimental work from the glass making process to the micro-analysis of diffusion profiles. Since her defense in 2014, she now works in the glass elaboration department of Saint-Gobain Recherche.

Atomic mobility in calcium and sodium aluminosilicate melts at 1200°C

Corinne Claireaux*a, Marie-Hélène Chopinetb, Ekaterina Burovb, Emmanuelle Gouillartb, Mathieu Roskoszc & Michael J. Toplisd

Multicomponent chemical diffusion in liquids of the quaternary system CaO-Na2O-Al2O3-SiO2 has been studied. Diffusion-couple experiments were performed at 1200C and for different durations around a central composition of 64.5 wt% SiO2, 13.3 wt% Na2O, 10.8 wt% CaO, 11.4 wt% Al2O3, leading to an overconstrained system of equations that was used to determine the diffusion matrix of the system. The dominant eigenvector of the diffusion matrix was found to correspond to the exchange between sodium and calcium, consistent with the results of the ternary soda-lime-silica system. On the other hand, neither of the other two eigenvectors of the diffusion matrix of the quaternary system involve sodium. Given a factor of 50 between the dominant and second eigenvalue, diffusion couples involving the exchange of sodium oxide and a network-forming oxide result in strong uphill diffusion of calcium. The second eigenvector, corresponding to the exchange of calcium with silicon and aluminum, is close to the dominant eigenvector found in previous studies of ternary alkaline-earth aluminosilicate systems. Our results therefore suggest that simple systems may be used to understand diffusive mechanisms in more complex systems.

aElaboration des Verres, Saint-Gobain Recherche, 39 quai Lucien Lefranc, 93300 Aubervilliers, France
bSurface du Verre et Interfaces (UMR 125), CNRS/Saint-Gobain Recherche, 39 quai Lucien Lefranc, 93300 Aubervilliers, France
cMuséum National d’Histoire Naturelle, Institut de Minéralogie, de physique de la matière condensée et de cosmochimie, Sorbonne University, Paris, France
dLaboratoire Dynamique Terrestre et Planétaire (UMR 5562), Observatoire Midi-Pyrénées, 14 avenue Belin, Toulouse, 31400, France