Berlin 2015 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 17: Postersession I
MM 17.30: Poster
Montag, 16. März 2015, 18:00–20:00, Poster E
Real space morphological analysis of multilevel domain structures in polycrystalline ferroelectric relaxors — •danka gobeljic1, vladimir v shvartsman1, sergei v kalinin2, stephen jesse2, and doru c lupascu1 — 1Institute for Material Science and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Essen, Germany — 2Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, USA
The local domain configuration and its dynamics play a vital role in the properties of ferroelectric materials. Therefore, domain architectures have been subject to systematic theoretical and experimental studies. The expected regularity of domain patterns is often distorted in real materials. In particular, this is typical for system with inherent disorder, e.g. for relaxors. Maze-like domain structures have been reported for the latter. To extract quantitative characteristics of such complex domain patterns one needs a special analytical tool. We introduce the quantitative line-of-sight (LoS) domain structure analysis. Based on 2D spatial maps of domain structures obtained by piezoresponse force microscopy (PFM), the LoS provides a quantitative measure of the characteristic domain shape, size, and spatial organization. We demonstrate the validity of this technique for Bi1/2Na1/2TiO3-BaTiO3 based relaxor ceramics. The parameters of the complex domain morphology are discussed in the context of grain orientation and local composition.Beyond comprehensive investigation of the local properties, LoS is applied as a comparative tool in the study of the macroscopic properties of the investigated ceramics.