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DF: Fachverband Dielektrische Festkörper

DF 9: Poster Session DF

DF 9.16: Poster

Tuesday, April 1, 2014, 18:30–20:00, P1

Ferroelectric Domains at the Phase Transition in Bariumtitanate — •Thorsten Limböck and Elisabeth Soergel — Institute of Physics, University of Bonn, Nussallée 12, 53115 Bonn, Germany

The classical example of a perovskite crystal, Bariumtitanate, exhibits several phase transitions, namely from rhombohedral to orthorhombic (at -90°C)to tetragonal (at +7°C) to cubic (at +120°C). In order to investigate the behave of the ferroelectric domain patterns at the phase transition occurring at +7°C we upgraded our scanning force microscope with a Peltier cooler/heating stage allowing for operation in a temperature range between -80°C and +120°C. Piezoresponse force microscopy (PFM) images, directly mapping the ferroelectric domain configuration, can be acquired either at fixed temperature or, when using a custom-designed script, during temperature ramps linked to the scanning process. We can thereby record the emergence of the domains at high temperatures but also the change of the domain patterns across the orthorhombic to tetragonal phase transition.