Pressure-induced charge amorphisation in BiNiO3
The order or disorder of electrons is fundamental to materials properties and also provides simple analogues to the different states of matter. A charge ordered (CO) insulating state, analogous to a crystalline solid, is observed in many mixed valence materials. On heating, this melts to a charge liquid (metallic) phase, often with interesting associated physics and functions such as the Verwey transition of Fe<sub>3</sub>O<sub>4</sub>, colossal magnetoresistances in manganites (e.g., La<sub>0.5</sub>Ca<sub>0.5</sub>MnO<sub>3</sub>), and superconductivity in K-doped BaBiO<sub>3</sub>. Here we report the observation of pressure induced charge amorphisation in a crystalline material. BiNiO<sub>3</sub> has charge distribution Bi<sup>3+</sup><sub>0.5</sub>Bi<sup>5+</sup><sub>0.5</sub>Ni<sup>2+</sup>O<sub>3</sub> with long range order of the Bi<sup>3+</sup> and Bi<sup>5+</sup> states at ambient pressure, but adopts another, structurally crystalline, but charge glassy, insulating phase at pressures of 4-5 GPa and temperatures below 200 K, before metallization above 6 GPa. This is analogous to the much-studied pressure induced amorphisations of many crystalline materials and melting is even observed at accessible pressure/temperature. BiNiO<sub>3</sub> provides fundamental insights to the study of amorphisation using charge states rather than atoms or molecules.
Authors
- Masaichiro Mizumaki (ORCID: https://orcid.org/0000-0002-7625-6665)
- J. Paul Attfield (ORCID: https://orcid.org/0000-0001-9763-3987)
- Yuki Sakai (ORCID: https://orcid.org/0000-0002-8427-4740)
- Matthew G. Tucker (ORCID: https://orcid.org/0000-0002-2891-7086)
- Yoshiya Uwatoko (ORCID: https://orcid.org/0000-0002-1148-4632)
- Takumi Nishikubo (ORCID: https://orcid.org/0000-0002-1250-3057)
- Yuichi Shimakawa (ORCID: https://orcid.org/0000-0003-1019-2512)
- Naoki Ishimatsu (ORCID: https://orcid.org/0000-0002-0222-8530)
- Shigehiro Takajo (ORCID: https://orcid.org/0000-0001-6898-2491)
- Saori I. Kawaguchi (ORCID: https://orcid.org/0000-0003-0970-7144)
- Wei‐Tin Chen (ORCID: https://orcid.org/0000-0003-4007-2984)
- Akihiko Machida (ORCID: https://orcid.org/0000-0002-7820-480X)
- Zhao Pan (ORCID: https://orcid.org/0000-0002-8693-2508)
- Olga Smirnova (ORCID: https://orcid.org/0000-0003-1065-0448)
- Hena Das (ORCID: https://orcid.org/0000-0001-5378-066X)
- Masaki Azuma (ORCID: https://orcid.org/0000-0002-8378-321X)
- Naomi Kawamura
- Masayuki Fukuda (ORCID: https://orcid.org/0000-0002-3153-9602)
- Tetsu Watanuki
- Mikio Takano
Institutions
- Hiroshima University (JP)
- Rutherford Appleton Laboratory (GB)
- Oak Ridge National Laboratory (US)
- National Taiwan University (TW)
- Chinese Academy of Sciences (CN)
- Kyoto University (JP)
- Kyoto Bunkyo University (JP)
- SPring-8 (JP)
- Japan Synchrotron Radiation Research Institute (JP)
- Innovative Research (United States) (US)
- National Institutes for Quantum Science and Technology (JP)
- Systems Biology Institute (JP)
- Research Institute for Production Development (JP)
- National Science and Technology Council (TW)
- Comprehensive Research Organization for Science and Society (JP)
- Kanagawa Industrial Technology Center (JP)
- Institute of Physics (CN)
- National Laboratory for Superconductivity (CN)
- Ehime University (JP)
- Kyoto University Institute for Chemical Research
- National Institute of Advanced Industrial Science and Technology (JP)
- The University of Tokyo (JP)
- Kumamoto University (JP)
- University of Edinburgh (GB)
Publication Details
- Journal
- Nature Communications
- Published
- 2025-03-05
- DOI
- https://doi.org/10.1038/s41467-025-57247-1
- Citations
- 1
- Primary Topic
- Thermal Expansion and Ionic Conductivity
- Type
- article
- Field-Weighted Citation Impact
- 0.52
Funders
- Engineering and Physical Sciences Research Council