Berlin 2012 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 5: Transport and Diffusion I
MM 5.3: Vortrag
Montag, 26. März 2012, 10:45–11:00, H 1029
Studies of atomic diffusion in crystalline alloys by XPCS — •Markus Stana1, Michael Leitner1,2, Manuel Ross1, and Bogdan Sepiol1 — 1Department of Physics, University of Vienna, 1090 Vienna, Austria — 2Physics-Department E13, TU Munich, 85747 Garching, Germany
X-ray photon correlation spectroscopy is a new method for investigating diffusion on the atomic scale. After our successful application in a Cu-Au single crystal [1], we investigated a Ni-Pt solid solution. As the question of the diffusion mechanism in this system seems settled, the experiment gives good insight in the feasibility and sensitivity of the method. Two samples, a polycrystalline and a single crystal, where prepared and measured at the European Synchrotron Radiation Facility in Grenoble. Activation energy, diffusion coefficient and basic information about the impurity-vacancy interaction has been derived. The talk will give an introduction to XPCS, an overview of our findings and an outlook towards future applications.
[1] M. Leitner, B. Sepiol, L. M. Stadler, B. Pfau, and G. Vogl, Atomic diffusion studied with coherent X-rays, Nature Mat. 8, 717 (2009).