Regensburg 2022 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
MM: Fachverband Metall- und Materialphysik
MM 10: Poster Session 1
MM 10.14: Poster
Monday, September 5, 2022, 18:00–20:00, P2
Determination of interdiffusion coefficients for Pt-Pd binary system by Atom Probe Tomography and DFT calculations — •Yoonhee Lee1, Xi Zhang2, Sebastian Manuel Eich1, Patrick Stender1, Blazej Grabowski2, and Guido Schmitz1 — 1Department for Materials Physics, Institute for Materials Science, University of Stuttgart, Heisenbergstr. 3, 70569 Stuttgart, Germany — 2Department of Materials Design, Institute for Materials Science, University of Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany
Understanding the diffusion behavior of different alloy components is fundamental and many systems are well evaluated with distinct diffusivities. However, despite its significant usage as a catalyst for many applications, the interdiffusion behavior of the Pt-Pd binary system has not yet been fully uncovered due to the remarkably slow atomic migration. In this work, interdiffusion coefficients have been determined from experimental data and compared with the results of DFT simulations. For the temperature range between 400 and 700°C, nano-sized multilayer samples were created by Ion-Beam Sputtering(IBS). After heat treatment, the samples are analyzed by Atom Probe Tomography (APT). Obtained composition profiles are fitted by a Fourier series approach and the respective interdiffusion coefficients are determined. For the temperature range between 800 and 970 °C, micron-sized Pt/Pd diffusion couples are used and analyzed using EDX. The respective interdiffusion coefficients are determined by the Boltzmann-Matano method. All interdiffusion coefficients are compared with DFT simulations.