Berlin 2012 – wissenschaftliches Programm

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DF: Fachverband Dielektrische Festkörper

DF 15: Dielectric and ferroelectric thin films

DF 15.1: Hauptvortrag

Donnerstag, 29. März 2012, 09:30–10:10, EB 107

Dielectric perovskite oxides: Always good for a surprise — •Annette Bussmann-Holder — Max-Planck-Institut für Festkörperforschung, Heisenbergstr. 1, D-70569 Stuttgart, Deutschland

Dielectric perovskite oxides exhibit multiple complex phases which vary from purely displacive to order/disorder driven to precursor dynamics. Four special cases are in the focus of this talk: the cases of BaTiO₃, relaxor ferroelectrics, SrTiO₃ and its isotope induced ferroelectric state, and finally EuTiO₃ and its mixed crystals with SrTiO₃. It is shown, that for all these compounds a single model can account for the very different dynamical behaviour and that coexistences and crossovers in the dynamics occur which invalidate categorizing dielectric perovskites.