Time: 12:10 pm - 1:20 pm
Abstract: Viscosity is a most important physical property of silicate melts as it controls mass and heat transfer in the Earth’s interiors, as well as in high temperature industrial melting such as glass making. Although viscosity models are of fundamental importance for both glass making and volcanology, prediction of viscosity is made difficult by extremely strong dependences on temperature and chemical composition. In fact the viscosity of melts varies generally by more than 10 orders of magnitude between superliquidus conditions and the glass transition range. Similarly, at constant temperature, one can observe comparable differences as a function of composition since at 1500 K, for example, the viscosity of pure SiO2 is about 10 orders of magnitude higher than that of window glass.
Recent work has provided a theoretical framework for understanding viscosity variations in terms of configurational entropy, which in addition, give valuable macroscospic and microscopic information on the structure of melts. In this presentation, I will give an extensive overview of the viscosity of silicate melts as a function of temperature and chemical composition. Particular interest will be paid to the way viscosity can be predicted quantitatively.
Biography: Daniel R. Neuville was born in Millau, France. Currently he is Senior Research Director at CNRS-IPGP. In 1992, he obtained his PhD in Geochemistry (University Paris Diderot, IPGP). Since 2014, he is the head of the Geomatériaux group of IPGP. Since 2013, he is in charge of the Master of Geochemistry, geomaterial, geobiology program of University Paris Diderot. He was secretary of the French Mineralogical and Cristallography Society, between 1994 and 2009. He has organized several international workshops and schools and convened many sessions at international meetings, such as ICG, ESGT, PNCS, EGU, Goldschmidt, IMA, AGU. He is member of IPGP scientific council, and several other councils. In 1999, he obtained the Jean Rose Price by the French Association of Science and in 2007-2008, he was Joubin-James Invited professor at University of Toronto. He was elected Fellow of the Mineralogical Society of America in 2018.
Since 2007, he serves as Editor of the amorphous material issues of the American Mineralogist; Guest Editor for Elements, (2010), vol 6, "Thermodynamics: the oldest branch of earth science", and (2020) vol 16, “The redox engine of the Earth“; Guest Editor for Review in Mineralogy and Geochemistry (2014) "Spectroscopic methods in Mineralogy and Material Sciences" and (2020) "Liquids and Glasses, Melts and Magmas" and an AGU monography (2020) "Magma Redox Geochemistry". In 2013 and 2017, he was co-editor of "From glass to crystal: nucleation, growth and phase separation, from research to applications" respectively in French and English. In 2012, he was elected president of the French glass society (USTV), and relected in 2015 and 2018. He was the president of the European Society of Glass Science and Technology (2016-2018). Since 2013, he is elected Chair of the TC3 Committee of the Physic and Chemistry of Glass of the International Glass Commission. Since 2014, he is the elected chair of the commission of Mineral Physics of the International Mineralogical Association. He has published about 190 international articles, and given more than 300 presentations at international congresses, more than 60 invited conferences