Berlin 2012 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 21: Microstructure and Phase Transformations II
MM 21.5: Vortrag
Dienstag, 27. März 2012, 11:15–11:30, H 0106
Investigation of Grain Growth in SrTiO3 by diffraction contrast tomography and modelling — •Daniel Weygand1, Melanie Syha1, Wolfgang Rheinheimer1, Wolfgang Ludwig2, Erich Lauridsen3, and Peter Gumbsch1,4 — 1KIT, IAM, Karlsruhe, Germany — 2ESRF, Grenoble, France — 3Risoe National Lab., Roskilde, Denmark — 4IWM, Freiburg, Germany
The grain growth dynamics of bulk SrTiO3 samples have revealed a puzzling growth behaviour, the sudden decrease of the growth rate with increasing temperature [1]. Metallographic analysis of two-dimensional sections through the bulk samples has not revealed any specific quantities, related to this growth acceleration.
Therefore diffraction contrast tomography measurements and subsequent reconstructions of the three dimensional grain structures in SrTiO3 and three dimensional grain growth modelling have been employed to characterize the grain structure. Samples have been analysed at different states of the heat-treatment. This allows determining the growth dynamics of specific grains, knowing the geometry and crystallographic orientations of the surrounding grains.
[1] Bäurer, M., Weygand, D., Gumbsch, P. and Hoffmann, M.J.: Grain growth anomaly in strontium titanate, Scripta Mat. 61 (2009),584.
[2] M. Syha, W. Rheinheimer, M. Bäurer, E.M. Lauridsen, W. Ludwig, D. Weygand, P. Gumbsch, Three-dimensional grain structure of sintered strontium titanate from X-ray diffraction contrast tomography, Script Mat. 66 (2012) 1.