{
  "abstract": "Solid oxide fuel cells (SOFCs) require electrolytes with high oxide-ion conductivity at low temperatures (200–400 °C) to reduce costs. Here, we report that Bi 1.9 Te 0.1 LaO 4.05 Br exhibits oxide-ion conductivity of 0.01 S cm⁻¹ at 233 °C within the “Norby gap” in dry atmospheres. This performance exceeds that of leading proton conductors, such as BaZr 0.8 Y 0.2 O 2.9 and BaZr 0.4 Ce 0.4 Y 0.1 Yb 0.1 O 2.9 , as well as representative oxide-ion conductors, including yttria-stabilized zirconia (YSZ), LaGaO ₃ -based phases (LSGM), and Bi ₂ V 0.7 Sb 0.3 O 5.5 . Bi 1.9 Te 0.1 LaO 4.05 Br also exhibits negligible chemical expansion and high chemical stability under oxidizing, reducing, and CO ₂ -containing atmospheres. The high conductivity is associated with a layered Sillén structure composed of Bi-containing triple fluorite-like slabs and Br layers, together with oxygen vacancies that enable vacancy-mediated oxide-ion migration. Despite the presence of excess oxide ions, oxide-ion transport predominantly occurs via a vacancy mechanism, as revealed by ab initio molecular dynamics simulations, static density functional theory calculations, and neutron diffraction analyses. These findings establish a design principle for high-performance oxide-ion conductors based on vacancy-mediated oxide-ion transport in excess-oxygen Bi-containing Sillén oxyhalides.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": "research article",
  "arxiv": null,
  "author_total": 11,
  "authors": [
    {
      "name": "Yusuke Kanenori"
    },
    {
      "name": "Hidetoshi Udagawa"
    },
    {
      "name": "Kei Saito",
      "orcid": "0009-0007-0389-9196"
    },
    {
      "name": "Yuichi Sakuda"
    },
    {
      "name": "Kotaro Fujii",
      "orcid": "0000-0003-3309-9118"
    },
    {
      "name": "Maksymilian Kluczny"
    },
    {
      "name": "Mudasir A. Yatoo",
      "orcid": "0000-0003-0970-5683"
    },
    {
      "name": "Kazuhiro Mori"
    },
    {
      "name": "Tatsumi Ishihara",
      "orcid": "0000-0002-7434-3773"
    },
    {
      "name": "Stephen J. Skinner",
      "orcid": "0000-0001-5446-2647"
    },
    {
      "name": "Masatomo Yashima",
      "orcid": "0000-0001-5406-9183"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/4465h1emadss0.bib",
  "cited_by": 0,
  "doi": "10.1038/s41467-026-77848-8",
  "fulltext_url": "https://europepmc.org/articles/PMC13669333",
  "id": "4465h1emadss0",
  "issns": [
    "2041-1723"
  ],
  "landing_url": "https://www.nature.com/articles/s41467-026-77848-8",
  "language": "eng",
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0",
  "metadata_licence": null,
  "native_subjects": [
    [
      "openalex",
      "2505|Advancements in Solid Oxide Fuel Cells"
    ]
  ],
  "openalex": "W7221781205",
  "pdf_url": "https://www.nature.com/articles/s41467-026-77848-8.pdf",
  "pmcid": "PMC13669333",
  "pmid": "42875472",
  "published": "2026-10-14",
  "publisher": "Springer Science and Business Media LLC",
  "ris": "https://research.draconitic.com/paper/4465h1emadss0.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:38Z",
      "native_id": "10.1038/s41467-026-77848-8",
      "source": "crossref",
      "url": "https://www.nature.com/articles/s41467-026-77848-8"
    },
    {
      "first_seen": "2026-10-30T12:18:46Z",
      "native_id": "MED:42875472",
      "source": "europepmc",
      "url": "https://europepmc.org/article/MED/42875472"
    }
  ],
  "subjects": [
    {
      "field": "chemistry",
      "origin": "openalex:2505|Advancements in Solid Oxide Fuel Cells",
      "subfield": "electrochemistry-energy"
    }
  ],
  "title": "Vacancy-mediated ultrafast oxide-ion conduction in excess-oxygen Sillén oxybromides",
  "title_text": "Vacancy-mediated ultrafast oxide-ion conduction in excess-oxygen Sillén oxybromides",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:18:46Z",
  "url": "https://research.draconitic.com/paper/4465h1emadss0",
  "venue": "Nature Communications",
  "versions": []
}