Room-temperature bulk plasticity and tunable dislocation densities in KTaO₃

Fang, Xufei1; Zhang, Jiawen2; Frisch, Alexander1; Preuss, Oliver3; Okafor, Chukwudalu1; Setvin, Martin4; Lu, Wenjun2

2024-07-01

10.1111/jace.20040

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

0002-7820

1551-2916

We report room-temperature bulk plasticity mediated by dislocations in single-crystal cubic potassium tantalate oxide (KTaO3), contrasting the conventional knowledge that single-crystal KTaO3 is susceptible to brittle fracture. A mechanics-based combinatorial experimental approach using cyclic Brinell indentation, scratching, and uniaxial bulk compression consistently demonstrates room-temperature dislocation plasticity in KTaO3 from the mesoscale to the macroscale. This approach also delivers tunable dislocation densities and plastic zone size. Scanning transmission electron microscopy analysis underpins the activated slip system to be <110> {110}. Given the growing significance of KTaO3 as an emerging electronic oxide and the increasing interest in dislocations for tuning the physical properties of oxides, our findings are expected to trigger synergistic research interest in KTaO3 with tunable dislocation densities.

bulk compression cyclic deformation dislocation KTaO3 scanning transmission electron microscopy

SCI

英语

通讯

European Research Council (ERC)[101076167] ; Deutsche Forschungsgemeinschaft[510801687] ; DFG[414179371] ; Czech Science Foundation[GACR 20-21727X] ; Shenzhen Science and Technology Program[JCYJ20230807093416034] ; National Natural Science Foundation of China[52371110] ; Guangdong Basic and Applied Basic Research Foundation[2023A1515011510]

Materials Science

Materials Science, Ceramics

WOS:001274405500001

WILEY

MATERIALS SCIENCE

Web of Science

1.Karlsruhe Inst Technol, Inst Appl Mat, D-76131 Karlsruhe, Germany
2.Southern Univ Sci & Technol, Dept Mech & Energy Engn, Shenzhen 518055, Peoples R China
3.Tech Univ Darmstadt, Dept Mat & Earth Sci, Darmstadt, Germany
4.Charles Univ Prague, Dept Surface & Plasma Phys, Prague, Czech Republic

Fang, Xufei,Zhang, Jiawen,Frisch, Alexander,et al. Room-temperature bulk plasticity and tunable dislocation densities in KTaO₃[J]. JOURNAL OF THE AMERICAN CERAMIC SOCIETY,2024.

Fang, Xufei.,Zhang, Jiawen.,Frisch, Alexander.,Preuss, Oliver.,Okafor, Chukwudalu.,...&Lu, Wenjun.(2024).Room-temperature bulk plasticity and tunable dislocation densities in KTaO₃.JOURNAL OF THE AMERICAN CERAMIC SOCIETY.

Fang, Xufei,et al."Room-temperature bulk plasticity and tunable dislocation densities in KTaO₃".JOURNAL OF THE AMERICAN CERAMIC SOCIETY (2024).