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Combining x-ray diffraction contrast tomography and mesoscale grain growth simulations in strontium titanate

An integrated approach for the investigation of microstructure evolution
: Syha, M.; Bräuer, M.; Rheinheimer, W.; Ludwig, W.; Lauridsen, E.M.; Weygand, D.; Gumbsch, P.


Kriven, W.M. ; American Ceramic Society -ACerS-, Westerville/Ohio:
Developments in strategic materials and computational design III : A collection of papers presented at the 36th International Conference on Advanced Ceramics and Composites, January 22 - 27, 2012, Daytona Beach, Florida; Including symposium and focused sessions papers
New York/N.Y.: Wiley and Sons, 2013 (Ceramic engineering and science proceedings 33.2012, Nr.10)
ISBN: 978-1-118-20600-3 (Print)
ISBN: 978-1-118-53054-2 (Online)
International Conference on Advanced Ceramics and Composites (ICACC) <36, 2012, Daytona Beach/Fla.>
Focused Session 2 "Computational Design, Modeling, Simulation and Characterization of Ceramics and Composites" <2012, Daytona Beach/Fla.>
Deutsche Forschungsgemeinschaft DFG
Deutsche Forschungsgemeinschaft DFG
Fraunhofer IWM ()
strontium titanate; X-ray diffraction contrast tomography; microstructure evolution; mesoscale grain growth simulations; crystallographic orientations

Motivated by the recently reported a growth anomaly in strontium titatate bulk samples1, the microstructure of bulk strontium titanate has been investigated by an integrated approach comprising conventional metallography, three dimensional X-ray diffraction contrast tomography (DCT)2, and the observation of pore shapes in combination with mesoscale grain growth simulations. The microstructural evolution in strontium titanate has been characterized alternating ex-situ annealing and high energy X-ray DCT measurements, resulting in three dimensional microstructure reconstructions which are complemented by crystallographic orientations obtained from diffraction information. These investigations allow to establish a correlation between grain morphology, orientation dependent grain boundary properties and growth behavior in these highly anisotropic materials. Together with energy and mobility data gathered in conventional metallographical analysis, they serve as input for a 3 D vertex dynamics model3.