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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. (Publisher's Version)
In: Journal of the American Ceramic Society, 105 (4), pp. 2399-2402. Wiley, e-ISSN 1551-2916,
DOI: 10.26083/tuprints-00020995,

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Item Type: Article
Origin: Secondary publication DeepGreen
Status: Publisher's Version
Title: Mechanical tailoring of dislocation densities in SrTiO₃ at room temperature
Language: English

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.

Journal or Publication Title: Journal of the American Ceramic Society
Volume of the journal: 105
Issue Number: 4
Place of Publication: Darmstadt
Publisher: Wiley
Uncontrolled Keywords: cyclic loading, dislocations, hardness, strontium titanate
Classification DDC: 500 Naturwissenschaften und Mathematik > 540 Chemie
600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften
Divisions: 11 Department of Materials and Earth Sciences > Material Science
Date Deposited: 08 Jul 2022 11:29
Last Modified: 08 Sep 2022 08:58
DOI: 10.26083/tuprints-00020995
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-209953
SWORD Depositor: Deep Green
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/20995
PPN: 498977110
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