Regensburg 2016 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MM: Fachverband Metall- und Materialphysik
MM 21: Microstructure and Phase Transformations I
MM 21.2: Vortrag
Dienstag, 8. März 2016, 12:00–12:15, H38
Time-resolved investigation of the liquid-solid phase transitions in supercooled liquid Argon and Krypton — •Alexander Schottelius1, Björn Beyersdorff2, Tiberio Ezquerra3, Stephan Roth2, and Robert Grisenti1 — 1Universität Frankfurt, Frankfurt am Main, Germany — 2Deutsches Elektronen Synchrotron (DESY), Hamburg, Germany — 3Instituto de Estructura de la Materia CSIC, Madrid, Spain
We will present new experimental results imaging the crystallization process in the two Lennard-Jones liquids, Argon and Krypton, using Small Angle and Wide Angle X-Ray Scattering (SAXS and WAXS). The sample was provided by a strongly supercooled micro-liquid jet inside a low pressure environment at cooling rates of up to 108 K/s. Due to the fact that the axial distance of the jet to its source can be translated into time scale, we were able to obtain a full movie of the phase transition by X-Ray scattering. In particular, while most of the final solid samples displayed the expected fcc- crystal structure, the WAXS diffraction patterns provide evidence of a hcp- structured crystal fraction for both Systems, Argon and Krypton.