Academic Journal
Tunable dislocations overcome mechano-functional tradeoff in perovskite oxides.
| Title: | Tunable dislocations overcome mechano-functional tradeoff in perovskite oxides. |
|---|---|
| Authors: | Zhang, Jiawen1, Lu, Wenjun1 luwj@sustech.edu.cn, Fang, Xufei2 xufei.fang@kit.edu |
| Source: | Science Advances. 8/7/2026, Vol. 12 Issue 32, p1-10. 10p. |
| Subject Terms: | *Mechanical behavior of materials, *Material plasticity, *Thermal conductivity, *Ceramics, *Ceramic engineering, *Oxide ceramics, *Dislocation structure |
| Abstract: | Recent advancements in dislocation engineering are reshaping the traditional view towards ceramics being brittle. Here, we use KTaO3 (KTO), a perovskite oxide that is newly discovered with room-temperature bulk plasticity, and demonstrate that the seeded dislocations can effectively tune both mechanical and functional properties. We uncover a brittle-ductile-brittle (BDB) transition: low dislocation densities lead to brittle failure, intermediate densities (~1014 m-2) enable superior compression plastic deformation capacity with strains over 20%, and high dislocation densities (~1015 m-2) induce brittle fracture again. This dislocation density-dependent non-monotonic mechanical response challenges the traditional behavior of ceramics and offers design opportunities. Furthermore, dislocation densities can monotonically decrease thermal conductivity, revealing a tradeoff between mechanical strength and functionality. The findings reveal a critical threshold of dislocation density in optimizing the performance of functional oxides, and provide a framework for using dislocations to design advanced materials where mechanical durability and enhanced functionality are intertwined. [ABSTRACT FROM AUTHOR] |
| Database: | Academic Search Index |
| FullText | Text: Availability: 0 CustomLinks: – Url: https://resolver.ebsco.com/c/fiv2js/result?sid=EBSCO:asx&genre=article&issn=23752548&ISBN=&volume=12&issue=32&date=20260807&spage=1&pages=1-10&title=Science Advances&atitle=Tunable%20dislocations%20overcome%20mechano-functional%20tradeoff%20in%20perovskite%20oxides.&aulast=Zhang%2C%20Jiawen&id=DOI:10.1126/sciadv.aed0057 Name: Full Text Finder (for New FTF UI) (ns324271) Category: fullText Text: Full Text Finder MouseOverText: Full Text Finder |
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| Header | DbId: asx DbLabel: Academic Search Index An: 196187493 RelevancyScore: 1452 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 1452.4248046875 |
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| Items | – Name: Title Label: Title Group: Ti Data: Tunable dislocations overcome mechano-functional tradeoff in perovskite oxides. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Zhang%2C+Jiawen%22">Zhang, Jiawen</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Lu%2C+Wenjun%22">Lu, Wenjun</searchLink><relatesTo>1</relatesTo><i> luwj@sustech.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Fang%2C+Xufei%22">Fang, Xufei</searchLink><relatesTo>2</relatesTo><i> xufei.fang@kit.edu</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Science+Advances%22">Science Advances</searchLink>. 8/7/2026, Vol. 12 Issue 32, p1-10. 10p. – Name: Subject Label: Subject Terms Group: Su Data: *<searchLink fieldCode="DE" term="%22Mechanical+behavior+of+materials%22">Mechanical behavior of materials</searchLink><br />*<searchLink fieldCode="DE" term="%22Material+plasticity%22">Material plasticity</searchLink><br />*<searchLink fieldCode="DE" term="%22Thermal+conductivity%22">Thermal conductivity</searchLink><br />*<searchLink fieldCode="DE" term="%22Ceramics%22">Ceramics</searchLink><br />*<searchLink fieldCode="DE" term="%22Ceramic+engineering%22">Ceramic engineering</searchLink><br />*<searchLink fieldCode="DE" term="%22Oxide+ceramics%22">Oxide ceramics</searchLink><br />*<searchLink fieldCode="DE" term="%22Dislocation+structure%22">Dislocation structure</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Recent advancements in dislocation engineering are reshaping the traditional view towards ceramics being brittle. Here, we use KTaO3 (KTO), a perovskite oxide that is newly discovered with room-temperature bulk plasticity, and demonstrate that the seeded dislocations can effectively tune both mechanical and functional properties. We uncover a brittle-ductile-brittle (BDB) transition: low dislocation densities lead to brittle failure, intermediate densities (~1014 m-2) enable superior compression plastic deformation capacity with strains over 20%, and high dislocation densities (~1015 m-2) induce brittle fracture again. This dislocation density-dependent non-monotonic mechanical response challenges the traditional behavior of ceramics and offers design opportunities. Furthermore, dislocation densities can monotonically decrease thermal conductivity, revealing a tradeoff between mechanical strength and functionality. The findings reveal a critical threshold of dislocation density in optimizing the performance of functional oxides, and provide a framework for using dislocations to design advanced materials where mechanical durability and enhanced functionality are intertwined. [ABSTRACT FROM AUTHOR] |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1126/sciadv.aed0057 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 10 StartPage: 1 Subjects: – SubjectFull: Mechanical behavior of materials Type: general – SubjectFull: Material plasticity Type: general – SubjectFull: Thermal conductivity Type: general – SubjectFull: Ceramics Type: general – SubjectFull: Ceramic engineering Type: general – SubjectFull: Oxide ceramics Type: general – SubjectFull: Dislocation structure Type: general Titles: – TitleFull: Tunable dislocations overcome mechano-functional tradeoff in perovskite oxides. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Zhang, Jiawen – PersonEntity: Name: NameFull: Lu, Wenjun – PersonEntity: Name: NameFull: Fang, Xufei IsPartOfRelationships: – BibEntity: Dates: – D: 07 M: 08 Text: 8/7/2026 Type: published Y: 2026 Identifiers: – Type: issn-print Value: 23752548 Numbering: – Type: volume Value: 12 – Type: issue Value: 32 Titles: – TitleFull: Science Advances Type: main |
| ResultId | 1 |