Berlin 2008 – wissenschaftliches Programm

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DF: Fachverband Dielektrische Festkörper

DF 5: Scanning and diffraction methods

DF 5.8: Vortrag

Montag, 25. Februar 2008, 17:10–17:30, EB 407

Time-resolved X-ray diffraction studies of piezoelectric actuators — •Florian Rödl, Peter Wochner, Ralf Weigel, and Helmut Dosch — Max-Planck-Institut für Metallforschung, Stuttgart, Germany

Piezoelectric materials play an important role in different applications ranging from nanoscale positioners to diesel engine fuel injectors. The internal structure of most devices is highly inhomogeneous and consists of stacks of ceramic layers with asymmetric electrode configurations. It is crucial to understand the structural response to the electrical excitation on the level of the individual grains especially in view of their highly inhomogeneous environment. One of the open questions is how does the local dynamic response of these materials influence the switching and fatigue behavior. Here we present an experimental strategy to perform real-time X-ray experiments on bulk PZT actuators during switching.

In this talk I will discuss the experimental setup we used at different synchrotron beamlines and first in-situ results. Depending on different parameters, like e.g. excitation profile, preloading and grain location, the dynamic response of the crystal lattice will be presented. A microbeam setup was used to study single grains.