Dislocation toughening in single-crystal KNbO3

Preuss, Oliver1; Bruder, Enrico2; Lu, Wenjun3; Zhuo, Fangping1; Minnert, Christian2; Zhang, Jiawen3; Roedel, Juergen1; Fang, Xufei1

2023-03-01

10.1111/jace.19088

JOURNAL OF THE AMERICAN CERAMIC SOCIETY   影响因子和分区

0002-7820

1551-2916

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 10(14) 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.

dislocation dislocation toughening fracture toughness oxide perovskite room-temperature plasticity

SCI ; EI

英语

其他

DFG[414179371]

Materials Science

Materials Science, Ceramics

WOS:000950437000001

WILEY

20231313807677

Domain walls ; Ductile fracture ; Fracture toughness ; High resolution transmission electron microscopy ; Perovskite ; Potassium compounds ; Single crystals

Minerals:482.2 ; Optical Devices and Systems:741.3 ; Crystalline Solids:933.1

MATERIALS SCIENCE

Web of Science

1.Tech Univ Darmstadt, Dept Mat & Earth Sci, Div Nonmet Inorgan Mat, Darmstadt, Germany
2.Tech Univ Darmstadt, Dept Mat & Earth Sci, Div Phys Met, Darmstadt, Germany
3.Southern Univ Sci & Technol, Dept Mech & Energy Engn, Shenzhen, Peoples R China

Preuss, Oliver,Bruder, Enrico,Lu, Wenjun,et al. Dislocation toughening in single-crystal KNbO3[J]. JOURNAL OF THE AMERICAN CERAMIC SOCIETY,2023,106(7):4371-4381.

Preuss, Oliver.,Bruder, Enrico.,Lu, Wenjun.,Zhuo, Fangping.,Minnert, Christian.,...&Fang, Xufei.(2023).Dislocation toughening in single-crystal KNbO3.JOURNAL OF THE AMERICAN CERAMIC SOCIETY,106(7),4371-4381.

Preuss, Oliver,et al."Dislocation toughening in single-crystal KNbO3".JOURNAL OF THE AMERICAN CERAMIC SOCIETY 106.7(2023):4371-4381.