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Ultra-dense dislocations stabilized in high entropy oxide ceramics

Author

Listed:
  • 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
    Beijing University of Technology)

  • Chunlei Wan

    (Tsinghua University)

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.

Suggested Citation

  • Yi Han & Xiangyang Liu & Qiqi Zhang & Muzhang Huang & Yi Li & Wei Pan & Peng-an Zong & Lieyang Li & Zesheng Yang & Yingjie Feng & Peng Zhang & Chunlei Wan, 2022. "Ultra-dense dislocations stabilized in high entropy oxide ceramics," Nature Communications, Nature, vol. 13(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-30260-4
    DOI: 10.1038/s41467-022-30260-4
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    References listed on IDEAS

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    1. Benjamin Butz & Christian Dolle & Florian Niekiel & Konstantin Weber & Daniel Waldmann & Heiko B. Weber & Bernd Meyer & Erdmann Spiecker, 2014. "Dislocations in bilayer graphene," Nature, Nature, vol. 505(7484), pages 533-537, January.
    2. Lixin Sun & Dario Marrocchelli & Bilge Yildiz, 2015. "Edge dislocation slows down oxide ion diffusion in doped CeO2 by segregation of charged defects," Nature Communications, Nature, vol. 6(1), pages 1-10, May.
    3. Abhishek Sarkar & Leonardo Velasco & Di Wang & Qingsong Wang & Gopichand Talasila & Lea de Biasi & Christian Kübel & Torsten Brezesinski & Subramshu S. Bhattacharya & Horst Hahn & Ben Breitung, 2018. "High entropy oxides for reversible energy storage," Nature Communications, Nature, vol. 9(1), pages 1-9, December.
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    2. Can Yildirim & Florian Flatscher & Steffen Ganschow & Alice Lassnig & Christoph Gammer & Juraj Todt & Jozef Keckes & Daniel Rettenwander, 2024. "Understanding the origin of lithium dendrite branching in Li6.5La3Zr1.5Ta0.5O12 solid-state electrolyte via microscopy measurements," Nature Communications, Nature, vol. 15(1), pages 1-8, December.
    3. Yunpeng Zheng & Qinghua Zhang & Caijuan Shi & Zhifang Zhou & Yang Lu & Jian Han & Hetian Chen & Yunpeng Ma & Yujun Zhang & Changpeng Lin & Wei Xu & Weigang Ma & Qian Li & Yueyang Yang & Bin Wei & Bing, 2024. "Carrier-phonon decoupling in perovskite thermoelectrics via entropy engineering," Nature Communications, Nature, vol. 15(1), pages 1-12, December.
    4. Jiaojiao Hu & Qiankun Yang & Shuya Zhu & Yong Zhang & Dingshun Yan & Kefu Gan & Zhiming Li, 2023. "Superhard bulk high-entropy carbides with enhanced toughness via metastable in-situ particles," Nature Communications, Nature, vol. 14(1), pages 1-12, December.

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