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Room‐temperature dislocation plasticity in SrTiO₃ tuned by defect chemistry

Stich, Stephan ; Ding, Kuan ; Muhammad, Qaisar Khushi ; Porz, Lukas ; Minnert, Christian ; Rheinheimer, Wolfgang ; Durst, Karsten ; Rödel, Jürgen ; Frömling, Till ; Fang, Xufei (2023)
Room‐temperature dislocation plasticity in SrTiO₃ tuned by defect chemistry.
In: Journal of the American Ceramic Society, 2021, 105 (2)
doi: 10.26083/tuprints-00023235
Article, Secondary publication, Publisher's Version

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Item Type: Article
Type of entry: Secondary publication
Title: Room‐temperature dislocation plasticity in SrTiO₃ tuned by defect chemistry
Language: English
Date: 2023
Place of Publication: Darmstadt
Year of primary publication: 2021
Publisher: Wiley
Journal or Publication Title: Journal of the American Ceramic Society
Volume of the journal: 105
Issue Number: 2
DOI: 10.26083/tuprints-00023235
Corresponding Links:
Origin: Secondary publication service
Abstract:

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.

Uncontrolled Keywords: defect chemistry engineering, dislocation plasticity, nanoindentation, oxygen vacancy, strontium titanate
Status: Publisher's Version
URN: urn:nbn:de:tuda-tuprints-232359
Classification DDC: 500 Science and mathematics > 530 Physics
500 Science and mathematics > 540 Chemistry
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
Date Deposited: 15 Feb 2023 13:24
Last Modified: 25 May 2023 06:24
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/23235
PPN: 507936647
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