2021 Fiscal Year Final Research Report
REBCO superconducting film with high-Tc and in-field Jc via low-temperature process
| Project/Area Number |
19K04350
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 21010:Power engineering-related
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| Research Institution | Shimane University |
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Principal Investigator |
Funaki Shuhei 島根大学, 学術研究院理工学系, 助教 (00602880)
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Keywords | 希土類系銅酸化物超伝導体(REBCO)の低温成膜 / 希土類系銅酸化物超伝導体(REBCO)の高品質化 / 希土類系銅酸化物超伝導体(REBCO)の液相成長 / 希土類系銅酸化物超伝導体(REBCO)の相変態 |
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| Outline of Final Research Achievements |
We have investigated to reduce the fabrication temperature of rare-earth (RE)-based high-Tc cuprate superconducting films, which exhibit superconductivity in inexpensive liquid nitrogen (77 K), and to introduce a magnetic flux pinning center. By using potassium hydroxide as a solvent, we succeeded in depositing REBa3Cu4O8, in which the composition ratio of RE and Ba does not change easily, at low temperatures and obtaining high-quality REBa2Cu3Oy through subsequent phase transformation heat treatment. Furthermore, we have succeeded in synthesizing REBa3Cu4O8 on various substrates for application to superconducting wires, and have also established a technique for superconducting joints between RE-based superconducting wires. We have also approached a short deposition time on the order of minutes.
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| Free Research Field |
機能性酸化物材料の機能向上に関する研究
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| Academic Significance and Societal Importance of the Research Achievements |
超伝導体は電気抵抗0で電流を流せることから，送電・配電による電力ロスを軽減できる省エネ技術であり，脱炭素社会に向けたキーテクノロジーである．しかしながら，その作製コストや運転コスト（冷媒，電力）が社会実装に向けた課題であった．本研究では，これまで製造に800℃以上の温度，かつ高真空環境が必要であった希土類系銅酸化物高温超伝導膜を600℃程度の低温化，かつ大気圧中で作製する技術を明らかにするとともに，永久電流モードで運転可能な超伝導線材同士の超伝導接合を実現した．これは超伝導技術が社会実装されるために必要なゲームチェンジングテクノロジーであり，今後の脱炭素社会に向けた大きな一歩である．
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