Ultra-dense dislocations stabilized in high entropy oxide ceramics

Yi Han, Xiangyang Liu, Qiqi Zhang, Muzhang Huang, Yi Li, Wei Pan (), Peng-an Zong, Lieyang Li, Zesheng Yang, Yingjie Feng, Peng Zhang () and Chunlei Wan ()
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Yi Han: Tsinghua University
Xiangyang Liu: Tsinghua University
Qiqi Zhang: National Center for Electron Microscopy in Beijing
Muzhang Huang: Tsinghua University
Yi Li: Tsinghua University
Wei Pan: Tsinghua University
Peng-an Zong: Tsinghua University
Lieyang Li: Tsinghua University
Zesheng Yang: Tsinghua University
Yingjie Feng: Tsinghua University
Peng Zhang: Tsinghua University
Chunlei Wan: Tsinghua University

Nature Communications, 2022, vol. 13, issue 1, 1-9

Abstract: Abstract Dislocations are commonly present and important in metals but their effects have not been fully recognized in oxide ceramics. The large strain energy raised by the rigid ionic/covalent bonding in oxide ceramics leads to dislocations with low density (∼106 mm−2), thermodynamic instability and spatial inhomogeneity. In this paper, we report ultrahigh density (∼109 mm−2) of edge dislocations that are uniformly distributed in oxide ceramics with large compositional complexity. We demonstrate the dislocations are progressively and thermodynamically stabilized with increasing complexity of the composition, in which the entropy gain can compensate the strain energy of dislocations. We also find cracks are deflected and bridged with ∼70% enhancement of fracture toughness in the pyrochlore ceramics with multiple valence cations, due to the interaction with enlarged strain field around the immobile dislocations. This research provides a controllable approach to establish ultra-dense dislocations in oxide ceramics, which may open up another dimension to tune their properties.

Date: 2022
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DOI: 10.1038/s41467-022-30260-4

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