Exploratory research on high-performance conductive oxides for practical high-temperature superconducting wires.

2023 Fiscal Year Final Research Report

• Project/Area Number: 21H01369
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 21050:Electric and electronic materials-related
• Research Institution: Kyoto University
• Principal Investigator: DOi Toshiya 京都大学, エネルギー科学研究科, 教授 (30315395)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 高温超伝導線材 / エピタキシャル成長 / 導電性酸化物 / REBa2Cu3O7 / 貴金属フリー

Outline of Final Research Achievements

We have conducted an exploratory study on new conductive buffer layer materials. Ni+(Sr1-XLaX)TiO3 facilitates the production of low-cost RE123 high-temperature superconducting wires without using silver. The study found that the combination of Ni+(Sr1-XLaX)TiO3 meets all necessary criteria.
We epitaxially grew Ni, (Sr0.95La0.05)TiO3, and YBa2Cu3O7 superconducting layers on {100}<001> textured Cu tapes. The critical current density (Jc) at 77 K was found to be 1.1 MA/cm2, surpassing the practical level. Furthermore, the interlayer resistance between the copper tape and the YBa2Cu3O7 layer measured at 77 K was 19 μΩcm2, and the resistivity was 0.13Ωcm, indicating that the resistance remained sufficiently low.

Free Research Field

材料科学

Academic Significance and Societal Importance of the Research Achievements

本研究成果を市販の高温超伝導線材に適用することで、性能を維持したまま大幅な低コスト化が達成できる。低価格な高温超伝導線材が製造されるようになれば、実用化できれば、送配電網や電力機器の高効率化による大幅なCO2排出量低減が達成できる。また、船舶や航空機の電動化、フュージョンエネルギ（核融合発電）の実現を後押しできる。更に磁気共鳴画像診断装置（MRI）などの低価格化や維持費低下によって、医療費の低減に貢献するなど、社会に大きく貢献することになる。