DPG Phi
Verhandlungen
Verhandlungen
DPG

Dresden 2017 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

MM: Fachverband Metall- und Materialphysik

MM 9: Topical session: Dynamics, relaxation and deformation in deeply supercooled metallic liquids and glasses II - Undercooled Melts

MM 9.3: Talk

Monday, March 20, 2017, 12:15–12:30, IFW A

Self-diffusion in liquid gold-silicon investigated using quasi-elastic neutron scattering — •Zach Evenson1, Fan Yang2, Giovanna Simeoni1, and Andreas Meyer21Maier-Leibnitz Zentrum (MLZ) and Physik Department, Technische Universität München — 2Institute for Materials Physics in Space, German Aerospace Center, Cologne

We use incoherent quasi-elastic neutron scattering to study the atomic dynamics of gold in a eutectic Au81Si19 melt. Despite the glass-forming nature of this system, the gold self-diffusivity displays an Arrhenius behavior with a low activation energy characteristic of simple liquids. At high temperatures, long-range transport of gold atoms is well described by hydrodynamic theory with a simple exponential decay of the self-correlation function. On cooling towards the melting temperature, structural relaxation crosses over to a highly stretched exponential behavior. This suggests the onset of a heterogeneous dynamics, even in the equilibrium melt, and is indicative of a very fragile liquid.

100% | Mobile Layout | Deutsche Version | Contact/Imprint/Privacy
DPG-Physik > DPG-Verhandlungen > 2017 > Dresden