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Large mechanical properties enhancement in ceramics through vacancy-mediated unit cell disturbance

Chen, Zhuo (author)
Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Leoben, Austria
Huang, Yong (author)
Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Leoben, Austria
Koutná, Nikola, 1991- (author)
Linköpings universitet,Teoretisk Fysik,Tekniska fakulteten,Institute of Materials Science and Technology, TU Wien, A-1060, Vienna, Austria
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Gao, Zecui (author)
Institute of Materials Science and Technology, TU Wien, Vienna, Austria
Sangiovanni, Davide Giuseppe, 1979- (author)
Linköpings universitet,Teoretisk Fysik,Tekniska fakulteten
Fellner, Simon (author)
Institute of Materials Science and Technology, TU Wien, Vienna, Austria
Haberfehlner, Georg (author)
Institute of Electron Microscopy and Nanoanalysis, Graz University of Technology, Graz, Austria
Jin, Shengli (author)
Chair of Ceramics, Montanuniversität Leoben, Leoben, Austria
Mayrhofer, Paul H. (author)
Institute of Materials Science and Technology, TU Wien, Vienna, Austria
Kothleitner, Gerald (author)
Institute of Electron Microscopy and Nanoanalysis, Graz University of Technology, Graz, Austria; Graz Centre for Electron Microscopy, Graz, Austria
Zhang, Zaoli (author)
Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Leoben, Austria; Department of Materials Science, Montanuniversität Leoben, Leoben, Austria
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 (creator_code:org_t)
Nature Publishing Group, 2023
2023
English.
In: Nature Communications. - : Nature Publishing Group. - 2041-1723. ; 14:1
Related links:
https://doi.org/10.1...
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https://urn.kb.se/re...
https://doi.org/10.1...
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  • Journal article (peer-reviewed)
Abstract Subject headings
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  • Tailoring vacancies is a feasible way to improve the mechanical properties of ceramics. However, high concentrations of vacancies usually compromise the strength (or hardness). We show that a high elasticity and flexural strength could be achieved simultaneously using a nitride superlattice architecture with disordered anion vacancies up to 50%. Enhanced mechanical properties primarily result from a distinctive deformation mechanism in superlattice ceramics, i.e., unit-cell disturbances. Such a disturbance substantially relieves local high-stress concentration, thus enhancing deformability. No dislocation activity involved also rationalizes its high strength. The work renders a unique understanding of the deformation and strengthening/toughening mechanism in nitride ceramics.

Subject headings

NATURVETENSKAP  -- Fysik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences (hsv//eng)

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