Λεπτομέρειες βιβλιογραφικής εγγραφής
| Τίτλος: |
Tunable dislocations overcome mechano-functional tradeoff in perovskite oxides. |
| Συγγραφείς: |
Zhang, Jiawen1, Lu, Wenjun1 luwj@sustech.edu.cn, Fang, Xufei2 xufei.fang@kit.edu |
| Πηγή: |
Science Advances. 8/7/2026, Vol. 12 Issue 32, p1-10. 10p. |
| Θεματικοί όροι: |
*Mechanical behavior of materials, *Material plasticity, *Thermal conductivity, *Ceramics, *Ceramic engineering, *Oxide ceramics, *Dislocation structure |
| Περίληψη: |
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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