Dresden 2011 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 21: Topical Session Electron Theory I

MM 21.2: Topical Talk

Mittwoch, 16. März 2011, 11:30–12:00, IFW A

Diffuse scattering methods as a testbed for alloy theory — •Harald Reichert — European Synchrotron Radiation Facility, 38043 Grenoble, France

Based on high energy x-ray scattering we have developed new experimental tools in order to reveal details in the energetics of binary alloys with very high accuracy. The technique allows to collect scattering patterns in planes or, more recently, in 3D volumes in reciprocal space. High energy X-ray scattering is characterized by a large Ewald sphere. Similar to transmission electron microscopy, it is possible to map entire planes in reciprocal space with a single exposure employing 2D detectors. In the time-resolved mode the technique allows to follow phase transformations in-situ. In parallel, we have combined first-principles calculations of the alloy energetics with reciprocal space methods for the interpretation of the experimentally determined diffuse scattering maps. This has allowed us to separate chemical and strain-induced components in the effective pair interactions and visualize competing interactions in binary alloys. Applications of this general scheme to a number of binary metallic alloy systems will presented.