Regensburg 2007 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 13: Glass I (joint session with DF)
DY 13.5: Vortrag
Dienstag, 27. März 2007, 11:00–11:15, H23
Neutron scattering on levitated metallic droplets — •Andreas Meyer1, Dirk Holland-Moritz1, Sebastian Stueber2, Thomas Hansen3, and Tobias Unruh4 — 1Institut für Materialphysik im Weltraum, DLR Köln — 2Physik Department E13, TU München — 3ILL, Grenoble — 4FRM-II, TU München
We report on first quasielastic neutron scattering experiments on metallic droplets using an electromagnetic levitation device on the neutron time of flight spectrometer ToF-ToF of the FRM-II. With this containerless processing undercoolings of the liquids up to 230K below the melting point were achieved. In binary ZrNi and ternary ZrNiAl glass forming melts the undercooling leads to a slowing down of the atomic mobility. The relation to the atomic dynamics in bulk glass forming metallic alloys in a Zr base will be discussed. We measured static structure factors of these systems on the neutron diffractometer D20 of the ILL. By isotopic substitution partial structure factors are accessible in liquid ZrNi. The partial structure factors also serve as an input for numerical mode coupling calculations.