| About this Abstract |
| Meeting |
Materials Science & Technology 2011
|
| Symposium
|
Interfaces, Grain Boundaries and Surfaces from Atomistic and Macroscopic Approaches -- Fundamental and Engineering Issues
|
| Presentation Title |
Temperature Dependent Interface Energy and Mobility Anisotropy in Strontium Titanate |
| Author(s) |
Wolfgang Rheinheimer, Michael Bäurer, Michael J. Hoffmann, Peter Pfundstein, Dagmar Gerthsen |
| On-Site Speaker (Planned) |
Wolfgang Rheinheimer |
| Abstract Scope |
Grain growth in crystalline materials is influenced by the anisotropy of the grain boundary energy. Temperature dependent changes in the relative grain boundary energy will strongly influence grain growth behaviour. In the current study strontium titanate has been chosen as a model system for perovskite type ceramics commonly used in electronic devices. The relative surface energies were measured at different temperatures by exploring the shape of intragranular pores. The 3D Wulff shape was extracted from 2D SEM images and was found to be dominated by the {100}, {110} and {111} facets. However some adjacent orientations were also observed. In a second experiment the interface mobilities of the most relevant facets were obtained at different temperatures by performing growth experiments of single crystals embedded in polycrystals. This method allows splitting the contributions of grain boundary energy and mobility to grain growth needed as experimental input to growth simulations. |
| Proceedings Inclusion? |
Definite: A CD-only volume |