CHARACTERIZATION OF GRAIN BOUNDARY DISCONNECTIONS IN GENERAL GRAIN BOUNDARIES IN SrTiO3

Hadas Sternlicht 1 Wolfgang Rheinheimer 2 Michael J. Hoffmann 2 Wayne D. Kaplan 1
1Department of Materials Science and Engineering, Technion-Israel Institute of Technology, Haifa
2Institute of Applied Materials, Karlsruhe Institute of Technology, Karlsruhe

General grain boundaries (GBs) in SrTiO3 were found to contain steps along the boundary planes. The steps are likely correlated to the mechanism of grain boundary motion in SrTiO3. These steps were found to lie along the same crystallographic planes regardless of the annealing temperature or atmosphere, even if the measured GB mobility is drastically different. It was shown that the steps also had a dislocation component, creating overall grain boundary disconnections [1].

General GBs in polycrystalline SrTiO3 and GBs between a single crystal diffusion bonded to polycrystalline SrTiO3 were characterized using aberration corrected transmission electron microscopy (TEM) combined with exit wave reconstruction. While the steps tend to appear along the same crystallographic planes [1], the dislocations vary between different boundaries, and have no consistent structure and density. The atomistic termination of the steps tends to vary as well, yielding many possible terminations and step-chemistry.

[1]. H. Sternlicht, W. Rheinheimer, M. Hoffmann, W. Kaplan. The mechanism of grain boundary motion in SrTiO3, J. Mater. Sci. (2015) 1-9.









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