Abstract
Dependence of the electrical properties on grain-boundary plane orientation is examined by a combination of high-resolution transmission electron microscopy, impedance spectroscopy, and electron energy-loss spectrometry using two kinds of SrTiO3 Σ5 ([1 0 0]/36.8°) bicrystalline grain boundaries: symmetric (3 1 0) (18.4°/18.4°) and asymmetric (8.4°/28.4°). While the symmetric grain boundary is observed to be straight with the symmetric (3 1 0)//(3 1 0) plane orientation, the asymmetric grain boundary is faceted into symmetric (3 1 0)//(3 1 0) and (2 1 0)//(2 1 0), and asymmetric (1 0 0)//(4 3 0). Grain-boundary impedance is observed only in the asymmetric grain boundary, and the electron energy-loss spectrometry quantification indicates that the asymmetric (1 0 0)//(4 3 0) facets are more oxygen-deficient than the symmetric ones. The results suggest that the asymmetric (1 0 0)//(4 3 0) facets are the most resistive among the three different facets.
| Original language | English |
|---|---|
| Pages (from-to) | 4993-4997 |
| Number of pages | 5 |
| Journal | Acta Materialia |
| Volume | 56 |
| Issue number | 18 |
| DOIs | |
| Publication status | Published - 2008 Oct |
Bibliographical note
Funding Information:We thank Mrs. Ute Salzberger for the TEM specimen preparation. The help at the ARM of Mr. Rainer Höschen is acknowledged. This work was supported by the Korea Research Foundation Grant funded by the Korean Government (MOEHRD) (KRF-2007-314-D00107).
Keywords
- Annealing
- Electron energy-loss spectroscopy
- Grain-boundary structure
- Strontium titanate
- Transmission electron microscopy
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Polymers and Plastics
- Metals and Alloys