Evaluation of grain-boundaries and critical current properties in MgB2 superconductors
| Project/Area Number |
22860019
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| Research Category |
Grant-in-Aid for Research Activity Start-up
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| Allocation Type | Single-year Grants |
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| Research Field |
Physical properties of metals
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| Research Institution | The University of Tokyo |
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Principal Investigator |
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| Project Period (FY) |
2010 – 2011
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| Project Status |
Completed (Fiscal Year 2011)
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| Budget Amount *help |
¥3,146,000 (Direct Cost: ¥2,420,000、Indirect Cost: ¥726,000)
Fiscal Year 2011: ¥1,508,000 (Direct Cost: ¥1,160,000、Indirect Cost: ¥348,000)
Fiscal Year 2010: ¥1,638,000 (Direct Cost: ¥1,260,000、Indirect Cost: ¥378,000)
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| Keywords | 超伝導材料 / ナノ材料 / 環境材料 |
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| Research Abstract |
We have studied the microstructure, normal-state electrical connectivity and critical current density of ex-situ MgB_2 polycrystalline bulks prepared using systematically varied heating conditions under ambient pressure. The samples heated at high-temperatures of～900℃for a long period showed an increased packing factor, a larger intergrain contact area and a significantly improved electrical connectivity, all of which show the evidence of solid-state self-sintering of MgB_2. The sintered ex-situ MgB_2 bulks from the laboratory-made prereacted MgB_2 powder showed largely enhanced connectivity of～20%, which is the highest among pressureless ex-situ MgB_2 bulks, wires and tapes. Owing to the improved inter-grain coupling, high critical current density exceeding 0. 3 MA/cm^2 at 20 K under self-field was achieved. This study shows that moderately high-temperature, long-time processing is a simple but forcible way to extract the superior current carrying potential of high bulk density ex-situ MgB_2 through strengthening of inter-grain coupling by the self-sintering.
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Report
(3 results)
Research Products
(33 results)
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[Presentation] HPCVD法により作製したチルトMgB2薄膜の輸送臨界電流特性2010
Author(s)
山本明保, Marina Putti, Anatolii Polyanskii, Fumitake Kametani, Dmytro Abraimov, Alexander Gurevich, David Larbalestier, Chenggang Zhuang, XiaoxingXi,下山淳一,岸尾光二
Organizer
第83回2010年度秋季低温工学・超電導学会
Place of Presentation
鹿児島、日本
Year and Date
2010-12-01
Related Report
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[Presentation] HPCVD法により作製したチルトMgB2薄膜の輸送臨界電流特性2010
Author(s)
山本明保, Marina Putti, Anatolii Polyanskii, Fumitake Kametani, Dmytro Abraimov, Alexander Gurevich, David Larbalestier, Chenggang Zhuang, Xiaoxing Xi, 下山淳一, 岸尾光二
Organizer
第83回2010年度秋季低温工学・超電導学会
Place of Presentation
鹿児島、日本(口頭発表)
Year and Date
2010-12-01
Related Report
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[Presentation] Novel c-axisoriented ex-situ MgB2 conductors2010
Author(s)
A. Yamamoto, T. Mochizuki, H. Tanaka, H. Ogino, J. Shimoyama, K. Kishio, S. Horii, K. Wada, Y. Yamada, Y. Shimada, S. Hata, K. Ikeda, H. Nakashima
Organizer
Applied Superconductivity Conference 2010
Place of Presentation
ワシントンDC、米国
Year and Date
2010-08-05
Related Report
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[Presentation] Novel c-axis oriented ex-situ MgB2 conductors2010
Author(s)
A.Yamamoto, T.Mochizuki, H.Tanaka, H.Ogino, J.Shimoyama, K.Kishio, S.Horii, K.Wada, Y.Yamada, Y.Shimada, S.Hata, K.Ikeda, H.Nakashima
Organizer
Applied Superconductivity Conference 2010
Place of Presentation
ワシントンDC、米国(口頭発表)
Year and Date
2010-08-05
Related Report
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[Book] chemical doping andcritical current properties-2010
Author(s)
A. Yamamoto, J. Shimoyama, K. Kishio
Total Pages
33
Publisher
Nova Science Publishers、Advances inCondensed Matter and Materials Research, Volume 6, Chapter 4. Development inmaterials processing of MgB2-microstructure
Related Report
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