Dislocation toughening in single‐crystal KNbO3
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 an...
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| Veröffentlicht in: | Journal of the American Ceramic Society 2023-07, Vol.106 (7), p.4371-4381 |
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| container_title | Journal of the American Ceramic Society |
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| creator | Preuß, Oliver Bruder, Enrico Lu, Wenjun Zhuo, Fangping Minnert, Christian Zhang, Jiawen Rödel, Jürgen Fang, Xufei |
| description | 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. |
| doi_str_mv | 10.1111/jace.19088 |
| format | Article |
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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. 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| source | Wiley Online Library Journals Frontfile Complete |
| subjects | Crystal dislocations Crystal growth Curie temperature dislocation Dislocation density dislocation toughening Domain walls Electrical resistivity Ferroelectricity Fracture toughness Hardness tests Indentation Mechanical properties Optical microscopy oxide perovskite Potassium niobates Room temperature room‐temperature plasticity Superconductivity |
| title | Dislocation toughening in single‐crystal KNbO3 |
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