{
  "abstract": "Bi12Rh3Ag6I9 extends the Bi14Rh3I9 family of layered bismuth-rich iodides in which intermetallic topological-insulator sheets alternate with salt-like spacer layers. High-temperature synthesis yields phase-pure powders and millimeter-sized platelets. Single-crystal X-ray diffraction reveals a rhombohedral structure composed of [Bi12Rh3I]2+ layers and [Ag6I8]2- spacers. In this spacer, Ag+ cations occupy 75% of the tetrahedral voids of a double iodide layer, giving rise to intrinsic two-dimensional cation disorder and mobility. Electrochemical impedance spectroscopy reveals a room-temperature ionic conductivity of about 10-6 S cm-1. Density-functional theory including spin-orbit coupling predicts band inversion and weak-topological-insulator invariants, while angle-resolved photoemission spectroscopy corroborates the calculated bulk electronic structure, yielding an experimental bulk band gap of 286 meV. Transport measurements show strongly anisotropic, initially n-type conduction. During the initial measurement cycle, applied bias reduces the electron doping through slow electrochemical deintercalation of silver. After conditioning, bulk conduction is strongly reduced; transport below about 130 K becomes nonactivated, the bias-induced drift ceases below about 50 K as Ag+ motion freezes, and a pronounced resistivity drop perpendicular to the layers below 3.2 K is suggestive of a boundary-sensitive low-dimensional transport regime. Bi12Rh3Ag6I9 demonstrates that spacer chemistry provides a chemical lever for carrier-density control in layered topological insulators.",
  "abstract_shown": true,
  "affiliations": [
    "Faculty of Chemistry and Food Chemistry, Dresden University of Technology, 01062Dresden, Germany.",
    "Würzburg-Dresden Cluster of Excellence ctd.qmat, Dresden University of Technology, 01062Dresden, Germany.",
    "Faculty of Physics and Astronomy, University of Würzburg, 97074Würzburg, Germany.",
    "Leibniz Institute for Solid State and Materials Research, 01069Dresden, Germany.",
    "Department of Electrical and Photonics Engineering, Technical University of Denmark, 2800Kgs. Lyngby, Denmark.",
    "Center for Silicon Photonics for Optical Communications (SP.O.C), Technical University of Denmark, 2800Kgs. Lyngby, Denmark.",
    "Department of Physics and Astronomy, University of Bologna, 40127Bologna, Italy.",
    "Center for Computational Quantum Physics, Flatiron Institute, New York, New York10010, United States.",
    "Institute of Applied Physics, Dresden University of Technology, 01062Dresden, Germany.",
    "Institute of Materials Science, Dresden University of Technology, 01062Dresden, Germany."
  ],
  "article_type": "research article",
  "arxiv": null,
  "author_total": 12,
  "authors": [
    {
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        0,
        1
      ],
      "name": "Eduardo Carrillo-Aravena",
      "orcid": "0009-0009-5293-7456"
    },
    {
      "affs": [
        1,
        2
      ],
      "name": "Johannes Heßdörfer"
    },
    {
      "affs": [
        3,
        4,
        5
      ],
      "name": "Christian N Saggau",
      "orcid": "0000-0002-1289-2822"
    },
    {
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        1,
        2
      ],
      "name": "Armando Consiglio"
    },
    {
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        3
      ],
      "name": "Shailja Sharma"
    },
    {
      "affs": [
        1,
        2
      ],
      "name": "Friedrich Reinert"
    },
    {
      "affs": [
        1,
        2
      ],
      "name": "Giorgio Sangiovanni",
      "orcid": "0000-0003-2218-2901"
    },
    {
      "affs": [
        6,
        7
      ],
      "name": "Domenico Di Sante"
    },
    {
      "affs": [
        3
      ],
      "name": "Oleg Janson"
    },
    {
      "affs": [
        3,
        8,
        9
      ],
      "name": "Kornelius Nielsch",
      "orcid": "0000-0003-2271-7726"
    },
    {
      "affs": [
        3
      ],
      "name": "Nicolás Pérez"
    },
    {
      "affs": [
        0,
        1
      ],
      "name": "Michael Ruck",
      "orcid": "0000-0002-2391-6025"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/a7p7jfvhhy6he.bib",
  "cited_by": 0,
  "doi": "10.1021/acs.inorgchem.6c02517",
  "fulltext_url": "https://europepmc.org/articles/PMC13685412",
  "id": "a7p7jfvhhy6he",
  "issns": [
    "0020-1669",
    "1520-510X"
  ],
  "landing_url": "https://europepmc.org/article/MED/42895400",
  "language": "eng",
  "licence": "CC-BY",
  "licence_label": "CC BY",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "openalex",
      "3107|Topological Materials and Phenomena"
    ]
  ],
  "openalex": "W7220710699",
  "pdf_url": "https://europepmc.org/articles/PMC13685412?pdf=render",
  "pmcid": "PMC13685412",
  "pmid": "42895400",
  "published": "2026-10-01",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/a7p7jfvhhy6he.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:19:37Z",
      "native_id": "MED:42895400",
      "source": "europepmc",
      "url": "https://europepmc.org/article/MED/42895400"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "openalex:3107|Topological Materials and Phenomena",
      "subfield": "amo"
    }
  ],
  "title": "Bi12Rh3Ag6I9: Mobile Silver Ions and Surface-Dominated Transport in a Layered Weak Topological Insulator.",
  "title_text": "Bi12Rh3Ag6I9: Mobile Silver Ions and Surface-Dominated Transport in a Layered Weak Topological Insulator.",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:19:37Z",
  "url": "https://research.draconitic.com/paper/a7p7jfvhhy6he",
  "venue": "Inorganic chemistry",
  "versions": []
}