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Mechanical tailoring of dislocation densities in SrTiO₃ at room temperature

Okafor, Chukwudalu ; Ding, Kuan ; Zhou, Xiandong ; Durst, Karsten ; Rödel, Jürgen ; Fang, Xufei (2022)
Mechanical tailoring of dislocation densities in SrTiO₃ at room temperature.
In: Journal of the American Ceramic Society, 2022, 105 (4)
doi: 10.26083/tuprints-00020995
Article, Secondary publication, Publisher's Version

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Item Type: Article
Type of entry: Secondary publication
Title: Mechanical tailoring of dislocation densities in SrTiO₃ at room temperature
Language: English
Date: 2022
Place of Publication: Darmstadt
Year of primary publication: 2022
Publisher: Wiley
Journal or Publication Title: Journal of the American Ceramic Society
Volume of the journal: 105
Issue Number: 4
DOI: 10.26083/tuprints-00020995
Corresponding Links:
Origin: Secondary publication DeepGreen
Abstract:

Dislocation‐tuned functional properties such as electrical conductivity, thermal conductivity, and ferroelectric properties in oxides are attracting increasing research interest. A prerequisite for harvesting these functional properties in oxides requires successful introduction and control of dislocation density and arrangement without forming cracks, which is a great challenge due to their brittle nature. Here, we report a simple method to mechanically tailor the dislocation densities in single‐crystal perovskite SrTiO₃. By using a millimeter‐sized Brinell indenter, dislocation densities from ∼10¹⁰ to ∼10¹³ m⁻² are achieved by increasing the number of indenting cycles. Depending on tip radius and indenting load, large and crack‐free plastic zones over hundreds of micrometers are created. The dislocation multiplication mechanisms are discussed, and the work hardening in the plastic zone is evaluated by micro‐hardness measurement as a function of dislocation density. This simple approach opens many new opportunities in the area of dislocation‐tuned functional and mechanical studies.

Uncontrolled Keywords: cyclic loading, dislocations, hardness, strontium titanate
Status: Publisher's Version
URN: urn:nbn:de:tuda-tuprints-209953
Classification DDC: 500 Science and mathematics > 540 Chemistry
600 Technology, medicine, applied sciences > 620 Engineering and machine engineering
Divisions: 11 Department of Materials and Earth Sciences > Material Science
Date Deposited: 08 Jul 2022 11:29
Last Modified: 08 Sep 2022 08:58
SWORD Depositor: Deep Green
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/20995
PPN: 498977110
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