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Cooperative mechanisms of oxygen vacancy stabilization and migration in the isolated tetrahedral anion Scheelite structure

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Listed:
  • Xiaoyan Yang

    (Guilin University of Technology)

  • Alberto J. Fernández-Carrión

    (CNRS, CEMHTI UPR3079, Univ. Orléans)

  • Jiehua Wang

    (Guilin University of Technology)

  • Florence Porcher

    (Laboratoire Léon Brillouin, CEA Saclay)

  • Franck Fayon

    (CNRS, CEMHTI UPR3079, Univ. Orléans)

  • Mathieu Allix

    (CNRS, CEMHTI UPR3079, Univ. Orléans)

  • Xiaojun Kuang

    (Guilin University of Technology)

Abstract

Tetrahedral units can transport oxide anions via interstitial or vacancy defects owing to their great deformation and rotation flexibility. Compared with interstitial defects, vacancy-mediated oxide-ion conduction in tetrahedra-based structures is more difficult and occurs rarely. The isolated tetrahedral anion Scheelite structure has showed the advantage of conducting oxygen interstitials but oxygen vacancies can hardly be introduced into Scheelite to promote the oxide ion migration. Here we demonstrate that oxygen vacancies can be stabilized in the BiVO4 Scheelite structure through Sr2+ for Bi3+ substitution, leading to corner-sharing V2O7 tetrahedral dimers, and migrate via a cooperative mechanism involving V2O7-dimer breaking and reforming assisted by synergic rotation and deformation of neighboring VO4 tetrahedra. This finding reveals the ability of Scheelite structure to transport oxide ion through vacancies or interstitials, emphasizing the possibility to develop oxide-ion conductors with parallel vacancy and interstitial doping strategies within the same tetrahedra-based structure type.

Suggested Citation

  • Xiaoyan Yang & Alberto J. Fernández-Carrión & Jiehua Wang & Florence Porcher & Franck Fayon & Mathieu Allix & Xiaojun Kuang, 2018. "Cooperative mechanisms of oxygen vacancy stabilization and migration in the isolated tetrahedral anion Scheelite structure," Nature Communications, Nature, vol. 9(1), pages 1-11, December.
    • Handle: RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-018-06911-w
    DOI: 10.1038/s41467-018-06911-w
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    Cited by:

    1. Yuta Yasui & Masataka Tansho & Kotaro Fujii & Yuichi Sakuda & Atsushi Goto & Shinobu Ohki & Yuuki Mogami & Takahiro Iijima & Shintaro Kobayashi & Shogo Kawaguchi & Keiichi Osaka & Kazutaka Ikeda & Tos, 2023. "Hidden chemical order in disordered Ba7Nb4MoO20 revealed by resonant X-ray diffraction and solid-state NMR," Nature Communications, Nature, vol. 14(1), pages 1-10, December.

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