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Coupled electromigration–nanoindentation study on dislocation nucleation in SrTiO3.

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Title: Coupled electromigration–nanoindentation study on dislocation nucleation in SrTiO3.
Authors: Okafor, Chukwudalu1 (AUTHOR) chukwudalu.okafor2@kit.edu, Sayyadi‐Shahraki, Ahmad2 (AUTHOR), Bruns, Sebastian2 (AUTHOR), Frömling, Till3 (AUTHOR), Hirel, Pierre4 (AUTHOR), Carrez, Phillipe4 (AUTHOR), Durst, Karsten2 (AUTHOR), Fang, Xufei1 (AUTHOR) xufei.fang@kit.edu
Source: Journal of the American Ceramic Society. Oct2025, Vol. 108 Issue 10, p1-13. 13p.
Subjects: Dislocation nucleation, Strontium titanate, Mechanical behavior of materials, Oxygen vacancy, Oxide ceramics, Electrodiffusion, Dislocations in crystals, Nanoindentation
Abstract: Modern functional oxides are mainly engineered by doping, essentially by tuning the defect chemistry. Recent studies suggest that dislocations offer a new perspective for enhancing the mechanical and physical properties of ceramic oxides. This raises the question regarding the interaction between dislocations and point defects in ceramics. Here, we report the impact of defect chemistry on the mechanical response of single‐crystal strontium titanate, a prototype perovskite oxide. We demonstrate that electric field‐induced stoichiometry polarization alters the defect chemistry, primarily by tuning oxygen vacancies, resulting in a distinct difference in the maximum shear stresses for dislocation nucleation, as experimentally observed and corroborated by molecular dynamic simulation. The impact of indenter tip size and geometry on the dislocation nucleation behavior in samples with different point defect concentrations in ceramics is further elucidated. Similar to the electromigration findings, acceptor‐doped SrTiO3 facilitates dislocation nucleation due to the abundance of oxygen vacancies. These findings shed new light on the interaction between dislocations and point defects in oxides. They may pave the road for assessing the stability of the next‐generation functional ceramics engineered by dislocations. [ABSTRACT FROM AUTHOR]
Copyright of Journal of the American Ceramic Society is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Coupled electromigration–nanoindentation study on dislocation nucleation in SrTiO<subscript>3</subscript>.
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+the+American+Ceramic+Society%22">Journal of the American Ceramic Society</searchLink>. Oct2025, Vol. 108 Issue 10, p1-13. 13p.
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  Data: <searchLink fieldCode="DE" term="%22Dislocation+nucleation%22">Dislocation nucleation</searchLink><br /><searchLink fieldCode="DE" term="%22Strontium+titanate%22">Strontium titanate</searchLink><br /><searchLink fieldCode="DE" term="%22Mechanical+behavior+of+materials%22">Mechanical behavior of materials</searchLink><br /><searchLink fieldCode="DE" term="%22Oxygen+vacancy%22">Oxygen vacancy</searchLink><br /><searchLink fieldCode="DE" term="%22Oxide+ceramics%22">Oxide ceramics</searchLink><br /><searchLink fieldCode="DE" term="%22Electrodiffusion%22">Electrodiffusion</searchLink><br /><searchLink fieldCode="DE" term="%22Dislocations+in+crystals%22">Dislocations in crystals</searchLink><br /><searchLink fieldCode="DE" term="%22Nanoindentation%22">Nanoindentation</searchLink>
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  Data: Modern functional oxides are mainly engineered by doping, essentially by tuning the defect chemistry. Recent studies suggest that dislocations offer a new perspective for enhancing the mechanical and physical properties of ceramic oxides. This raises the question regarding the interaction between dislocations and point defects in ceramics. Here, we report the impact of defect chemistry on the mechanical response of single‐crystal strontium titanate, a prototype perovskite oxide. We demonstrate that electric field‐induced stoichiometry polarization alters the defect chemistry, primarily by tuning oxygen vacancies, resulting in a distinct difference in the maximum shear stresses for dislocation nucleation, as experimentally observed and corroborated by molecular dynamic simulation. The impact of indenter tip size and geometry on the dislocation nucleation behavior in samples with different point defect concentrations in ceramics is further elucidated. Similar to the electromigration findings, acceptor‐doped SrTiO3 facilitates dislocation nucleation due to the abundance of oxygen vacancies. These findings shed new light on the interaction between dislocations and point defects in oxides. They may pave the road for assessing the stability of the next‐generation functional ceramics engineered by dislocations. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of the American Ceramic Society is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1111/jace.70015
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 13
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    Subjects:
      – SubjectFull: Dislocation nucleation
        Type: general
      – SubjectFull: Strontium titanate
        Type: general
      – SubjectFull: Mechanical behavior of materials
        Type: general
      – SubjectFull: Oxygen vacancy
        Type: general
      – SubjectFull: Oxide ceramics
        Type: general
      – SubjectFull: Electrodiffusion
        Type: general
      – SubjectFull: Dislocations in crystals
        Type: general
      – SubjectFull: Nanoindentation
        Type: general
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      – TitleFull: Coupled electromigration–nanoindentation study on dislocation nucleation in SrTiO3.
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            – D: 01
              M: 10
              Text: Oct2025
              Type: published
              Y: 2025
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