期刊
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
卷 105, 期 2, 页码 1318-1329出版社
WILEY
DOI: 10.1111/jace.18118
关键词
defect chemistry engineering; dislocation plasticity; nanoindentation; oxygen vacancy; strontium titanate
资金
- Athene Young Investigator Programme at TU Darmstadt
- Deutscher Akademischer Austauschdienst [91669061]
Experimental modulation of dislocation-based plasticity in single-crystal SrTiO3 by increasing oxygen vacancy concentration impacts dislocation nucleation and motion. This is evidenced by nanoindentation and bulk compression tests on a nano-/microscale level.
Dislocations have been identified to modify both the functional and mechanical properties of some ceramic materials. Succinct control of dislocation-based plasticity in ceramics will also demand knowledge about dislocation interaction with point defects. Here, we propose an experimental approach to modulate the dislocation-based plasticity in single-crystal SrTiO3 based on the concept of defect chemistry engineering, for example, by increasing the oxygen vacancy concentration via reduction treatment. With nanoindentation and bulk compression tests, we find that the dislocation-governed plasticity is significantly modified at the nano-/microscale, compared to the bulk scale. The increase in oxygen vacancy concentration after reduction treatment was assessed by impedance spectroscopy and is found to favor dislocation nucleation but impede dislocation motion as rationalized by the nanoindentation pop-in and nanoindentation creep tests.
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