Regensburg 2025 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 9: Poster
MM 9.13: Poster
Montag, 17. März 2025, 18:30–20:30, P1
Inhomogeneities at different length scales in nanocrystalline Pd-Au prepared by inert gas condensation — Johannes Wild1, Fabian Andorfer4, Svetlana Korneychuk1,2,3, Jules M. Dake4, Torben Boll1, Dorothée Vinga Szabó1,2,3, Stefan Wagner1, Carl E. Krill III4, and •Astrid Pundt1,2 — 1Institute of Applied Materials (IAM-WK), Karlsruhe Institute of Technology — 2Institute of Nanotechnology (INT), Karlsruhe Institute of Technology — 3Karlsruhe Nano Micro Facility (KNMFi), Karlsruhe Institute of Technology — 4Institute of Functional Nanosystems, Ulm University
Inert gas condensation (IGC) is currently the only viable method to prepare bulk samples of nanocrystalline (NC) palladium-gold (Pd-Au). The raw material is thermally evaporated in a vacuum chamber with a background pressure of 10e-8 mbar that has been backfilled with low-pressure inert gas. On collision with the inert gas, the evaporated material condenses into small particles, which are then collected on a rotating cold finger, scraped off and mechanically compacted into disk-shaped samples.
In this study, we investigate the different types of inhomogeneities in IGC Pd-Au on different length scales and compare them to samples prepared by arc melting. To this end, we apply a variety of methods to accurately characterize the composition, porosity, grain size, grain orientation and grain growth behaviour on multiple length scales. Finally, we attempt to explain the source of the inhomogeneities and verify by probing the IGC experimental setup via various experiments.
Keywords: Inert Gas Condensation; Atom Probe Tomography; PdAu; Nanocrystalline; Orientation Imaging