Regensburg 2007 – wissenschaftliches Programm

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DF: Fachverband Dielektrische Festkörper

DF 11: Poster Session

DF 11.24: Poster

Donnerstag, 29. März 2007, 14:30–18:00, Poster C

Investigation of domain structuring in the relaxor system strontium-barium-niobate by k-space spectroscopy — •Uwe Voelker, Urs Heine, Christoph Gödeker, Rainer Pankrath, and Klaus Betzler — Universität Osnabrück, Fachbereich Physik, Barbarastr. 7, 49069 Osnabrück

We present results of second-harmonic-generation (SHG) investigations of the relaxor system strontium-barium-niobate Sr_0.61Ba_0.39Nb₂O₆ (SBN). Since the small birefringence in SBN prevents phase-matched SHG, we use a quasi-phase-matched arrangement in which the spatial distribution of the second harmonic intensity reflects the density distribution of domain sizes. This technique allows for conclusions on the k-space representation of the correlation lengths (k-space spectroscopy). We present information on the domain structuring forced by external electric fields. Repoling effects of particular size-classes of domains are studied and compared to pyroelectric measurements. The evolution of the domain morphology whilst passing the ferroelectric to paraelectric phase transition is reported. Supported by DFG (project GRK 695).