Berlin 2008 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 20: Glasses III (joint session DF/DY)

DY 20.3: Talk

Wednesday, February 27, 2008, 15:00–15:15, EB 407

In-situ study of dynamics in hydrous silicate melts with quasielastic neutron scattering — •fan yang¹, andreas meyer², tobias unruh³, and josef kaplonski¹ — ¹Physik-Department E13, TU München, 85748 Garching, Germany — ²Institut für Materialphysik im Weltraum, Deutsches Zentrum für Luft- und Raumfahrt, 51147 Köln, Germany — ³Forschungsneutronenquelle Heinz Maier-Leibnitz (FRM II), TU München, 85748 Garching, Germany

Dissolved water in silicate melts and glasses is of great interest in geoscience as well as in technical applications. We investigate water dynamics in silicate melts and the correlation between macroscopic properties like viscosity and the microscopic structure. With the intrinsic q resolution of quasielastic neutron scattering diffusion can be studied in great detail. Diffusion of water in sodium trisilicate melt was studied in-situ at different temperatures under a pressure of 200 MPa. The temperature dependence of the H diffusion coefficient obeys an Arrhenius law with an activation energy of about 0.36 eV.