SKM 2021 – wissenschaftliches Programm
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SYAM: Symposium Amorphous materials: structure, dynamics, properties
SYAM 1: Amorphous materials: structure, dynamics, properties
SYAM 1.3: Hauptvortrag
Dienstag, 28. September 2021, 14:30–15:00, Audimax 1
Connection between structural properties and atomic motion in ultraviscous metallic liquids close to the dynamical arrest — •Beatrice Ruta1, Nico Neuber2, Isabella Gallino2, and Ralf Busch2 — 1Univ Lyon 1, CNRS, Institut Lumière Matière, Villeurbanne, France — 2Chair of Metallic Materials, Saarland University, Saarbrücken, Germany
Glass-formers are considered as archetypes of complex systems and the glass transition keeps fascinating scientists since decades. Although the impressive works done in the last year, still little is known on the mechanism of atomic motion governing the dynamics in ultra-viscous liquids close to the dynamical arrest, due to the difficulty to prove the slow collective particle motion of glass formers.
Thanks to the use of intense coherent X-ray beams available in third generation synchrotrons, we have performed the first experimental investigations of the temperature and wavelength dependence of the atomic motion in supercooled alloys close to the glass transition [1-3]. We find that the dynamics is strongly influenced by the underlying structure which can lead to peculiar oscillations of the microscopic relaxation time in correspondence to structural features [3]. This behavior is accompanied by dramatic changes in the shape of the intermediate scattering functions and suggests the presence of large dynamical heterogeneities at the mesoscopic scale.
[1] S. Hechler et al. Phys. Rev. Mat., 2, 085603, 2018
[2] B. Ruta et al. Phys. Rev. Lett. 125, 055701 2020
[3] N. Neuber et al. In preparation