Pressure-induced charge amorphisation in BiNiO3

Wei-tin Chen, Takumi Nishikubo, Yuki Sakai, Hena Das, Masayuki Fukuda, Zhao Pan, Naoki Ishimatsu, Masaichiro Mizumaki, Naomi Kawamura, Saori I. Kawaguchi, Olga Smirnova, Mathew G. Tucker, Tetsu Watanuki, Akihiko Machida, Shigehiro Takajo, Yoshiya Uwatoko, Yuichi Shimakawa, Mikio Takano, Masaki Azuma () and J. Paul Attfield ()
Additional contact information
Wei-tin Chen: National Taiwan University
Takumi Nishikubo: Kanagawa Institute of Industrial Science and Technology
Yuki Sakai: Kanagawa Institute of Industrial Science and Technology
Hena Das: Kanagawa Institute of Industrial Science and Technology
Masayuki Fukuda: Institute of Science Tokyo
Zhao Pan: Institute of Science Tokyo
Naoki Ishimatsu: Hiroshima University 1-3-1 Kagamiyama
Masaichiro Mizumaki: Japan Synchrotron Radiation Research Institute, SPring-8
Naomi Kawamura: Japan Synchrotron Radiation Research Institute, SPring-8
Saori I. Kawaguchi: Japan Synchrotron Radiation Research Institute, SPring-8
Olga Smirnova: Kyoto University
Mathew G. Tucker: Chilton
Tetsu Watanuki: National Institutes for Quantum Science and Technology (QST)
Akihiko Machida: National Institutes for Quantum Science and Technology (QST)
Shigehiro Takajo: University of Tokyo
Yoshiya Uwatoko: University of Tokyo
Yuichi Shimakawa: Kyoto University
Mikio Takano: Kyoto University
Masaki Azuma: Kanagawa Institute of Industrial Science and Technology
J. Paul Attfield: University of Edinburgh

Nature Communications, 2025, vol. 16, issue 1, 1-7

Abstract: Abstract 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 Fe3O4, colossal magnetoresistances in manganites (e.g., La0.5Ca0.5MnO3), and superconductivity in K-doped BaBiO3. Here we report the observation of pressure induced charge amorphisation in a crystalline material. BiNiO3 has charge distribution Bi3+0.5Bi5+0.5Ni2+O3 with long range order of the Bi3+ and Bi5+ 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. BiNiO3 provides fundamental insights to the study of amorphisation using charge states rather than atoms or molecules.

Date: 2025
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DOI: 10.1038/s41467-025-57247-1

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