National University Corporation Okayama University
Unraveling the mystery of the high superconductivity of graphite co-doped with Group 1,2 metals – Calcium and potassium are related to water and oil! – [Nagoya Institute of Technology, Hiroshima City University, Okayama University]
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This is a press release of joint research results between Nagoya Institute of Technology, Hiroshima City University, and Okayama University.
April 30, 2024 (Reiwa 6) National University Corporation Okayama University https://www.okayama-u.ac.jp/
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-Key points of presentation-
We discovered a new perspective on the unique structure and
superconductivity of graphite-based materials.
Calcium and potassium in graphite were visualized using “fluorescent X-ray holography.”
We have obtained guidelines for creating high-performance
superconducting materials using abundant and inexpensive elements.
◆Overview
A research group consisting of Professor Koichi Hayashi of the Department of Engineering (Physical Engineering Field), Graduate School of Engineering, Nagoya Institute of Technology, Associate Professor Naohisa Happo, Graduate School of Information Science, Hiroshima City University, and Professor Yoshihiro Kubozono, Institute for Interdisciplinary Basic Science, Okayama University. succeeded in obtaining atomic images of calcium and potassium added to graphite using an advanced measurement method called “fluorescence X-ray holography” that can visualize the atomic arrangement. As a result, they discovered that calcium and potassium atoms do not mix randomly, but phase separate at the nanoscale, like water and oil.
Superconductivity has been considered to be a phenomenon that occurs easily in crystals with well-ordered structures. This discovery proves that heterogeneous crystals in which additive elements undergo phase separation also exhibit high transition temperatures. To solve energy problems, many researchers are working on developing room-temperature superconducting materials. The results of this study are an important step toward bringing the superconducting transition temperature closer to room temperature.
This research result was published in Chemistry of Materials on April 18, 2024. In addition, the illustration of the paper was accepted as Supplementary Cover Arts.
[Image 2: https://prtimes.jp/i/72793/2170/resize/d72793-2170-17098637c0496f60-1.jpg &s3=72793-2170-D41B6F7E7096B924Ee521B4 8714D52D-389×336.jpg] Hologram from calcium that makes graphite superconducting
◆Paper information Magazine name: Chemistry of Materials Paper title: Nanophase separation in K1-xCaxC8 revealed by X-ray fluorescence holography and extended X-ray absorption fine structure Author: N. Happo, A. Kubota, X. Yang, R. Eguchi, H. Goto, M. Ikeda, K. Kimura, Y. Takabayashi, J. R. Stellhorn, S. Hayakawa, K. Hayashi and Y. Kubozono Publication date: April 18, 2024 DOI: 10.1021/acs.chemmater.3c02832 URL: https://pubs.acs.org/doi/10.1021/acs.chemmater.3c02832
◆Research funding This research is supported by Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research, Academic Transformation Area Research (A) “Condensed Matter Science Created by Super-Ordered Structures” (Representative: Koichi Hayashi),
Fundamental Research (B) (Representative: Kuboen This work was carried out with the support of Yoshihiro (Yoshihiro) and others. (Project number: 17K05500, 18K03540, 18K04940, 18K18736, 19H02676, 20H05878, 20H05879, 20H05881, 23H05449) JASRI/SPring-8 research topic
(2016B0128, 2017B0128), Aichi Synchro Tron Light Center Research Project (202301014), Hiroshima University We received support for the research project of the Institute of Synchrotron Radiation Science (22BU006) and the research project of the Kyushu Synchrotron Light Research Center (2202003F).
◆About detailed research contents Unraveling the mystery of the high superconductivity of graphite co-doped with group 1,2 metals – Calcium and potassium are related to water and oil! –
https://www.okayama-u.ac.jp/up_load_files/press_r6/press20240425-2.pdf
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-About research- Professor Koichi Hayashi, Department of Engineering (Physical Engineering), Graduate School of Engineering, Nagoya Institute of Technology TEL: 052-735-5308 Naohisa Happo, Associate Professor, Department of Information Engineering, Graduate School of Information Science, Hiroshima City University TEL: 082-830 -1553 Okayama University Interdisciplinary Basic Science Research Institute Professor Yoshihiro Kubozono TEL: 086-251-7850
-Public Relations- Nagoya Institute of Technology Planning and Public Relations Division TEL: 052-735-5647
Hiroshima City University Secretariat Planning Office Planning Group TEL: 082-830-1666 Okayama University General Affairs and Planning Department Public Relations Division TEL: 086-251-7292
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