Preuß, Oliver ; Bruder, Enrico ; Lu, Wenjun ; Zhuo, Fangping ; Minnert, Christian ; Zhang, Jiawen ; Rödel, Jürgen ; Fang, Xufei (2023)
Dislocation toughening in single-crystal KNbO3.
In: Journal of the American Ceramic Society, 106 (7)
doi: 10.1111/jace.19088
Article, Bibliographie
This is the latest version of this item.
Abstract
The growing research interest in dislocation-tuned functionality in ceramics is evident, with the most recent proofs-of-concept for enhanced ferroelectric properties, electrical conductivity, and superconductivity via dislocations. In this work, we focus on dislocation-tuned mechanical properties and demonstrate that, by engineering high dislocation densities (up to 1014 m−2) into KNbO3 at room temperature, the fracture toughness can be improved by a factor of 2.8. The microstructures, including dislocations and domain walls, are examined by optical microscopy, electron channeling contrast imaging, piezo-response force microscopy, and transmission electron microscopy methods to shed light on the toughening mechanisms. In addition, high-temperature (above the Curie temperature of KNbO3) indentation tests were performed to exclude the influence of ferroelastic toughening, such that the origin of the toughening effect is pinpointed to be dislocations.
| Item Type: | Article |
|---|---|
| Erschienen: | 2023 |
| Creators: | Preuß, Oliver ; Bruder, Enrico ; Lu, Wenjun ; Zhuo, Fangping ; Minnert, Christian ; Zhang, Jiawen ; Rödel, Jürgen ; Fang, Xufei |
| Type of entry: | Bibliographie |
| Title: | Dislocation toughening in single-crystal KNbO3 |
| Language: | English |
| Date: | 5 May 2023 |
| Publisher: | Wiley |
| Journal or Publication Title: | Journal of the American Ceramic Society |
| Volume of the journal: | 106 |
| Issue Number: | 7 |
| DOI: | 10.1111/jace.19088 |
| Corresponding Links: | |
| Abstract: | The growing research interest in dislocation-tuned functionality in ceramics is evident, with the most recent proofs-of-concept for enhanced ferroelectric properties, electrical conductivity, and superconductivity via dislocations. In this work, we focus on dislocation-tuned mechanical properties and demonstrate that, by engineering high dislocation densities (up to 1014 m−2) into KNbO3 at room temperature, the fracture toughness can be improved by a factor of 2.8. The microstructures, including dislocations and domain walls, are examined by optical microscopy, electron channeling contrast imaging, piezo-response force microscopy, and transmission electron microscopy methods to shed light on the toughening mechanisms. In addition, high-temperature (above the Curie temperature of KNbO3) indentation tests were performed to exclude the influence of ferroelastic toughening, such that the origin of the toughening effect is pinpointed to be dislocations. |
| Uncontrolled Keywords: | dislocation, dislocation toughening, fracture toughness, oxide perovskite, room-temperature plasticity |
| Divisions: | 11 Department of Materials and Earth Sciences 11 Department of Materials and Earth Sciences > Material Science 11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials |
| Date Deposited: | 08 May 2023 05:24 |
| Last Modified: | 27 Nov 2023 07:28 |
| PPN: | 507592697 |
| Export: | |
| Suche nach Titel in: | TUfind oder in Google |
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Dislocation toughening in single‐crystal KNbO₃. (deposited 24 Nov 2023 13:24)
- Dislocation toughening in single-crystal KNbO3. (deposited 08 May 2023 05:24) [Currently Displayed]
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