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Estimation of critical current density and grain connectivity in superconducting MgB2 bulk using Campbell’s method
http://hdl.handle.net/10228/2463
http://hdl.handle.net/10228/24637a1be5b6-2603-4ce1-82a3-86df9f10938c
| 名前 / ファイル | ライセンス | アクション |
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Estimation.pdf (77.1 kB)
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| アイテムタイプ | 学術雑誌論文 = Journal Article(1) | |||||||||||||||||||||
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| 公開日 | 2009-08-05 | |||||||||||||||||||||
| 資源タイプ | ||||||||||||||||||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||||||||||||||||||
| 資源タイプ | journal article | |||||||||||||||||||||
| タイトル | ||||||||||||||||||||||
| タイトル | Estimation of critical current density and grain connectivity in superconducting MgB2 bulk using Campbell’s method | |||||||||||||||||||||
| 言語 | en | |||||||||||||||||||||
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| 言語 | eng | |||||||||||||||||||||
| 著者 |
Ni, B
× Ni, B× Morita, Y× Liu, Z× Liu, C× Himeki, K× 小田部, エドモンド 荘司
WEKO
572
× 木内, 勝
WEKO
631
× 松下, 照男 |
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| 抄録 | ||||||||||||||||||||||
| 内容記述タイプ | Abstract | |||||||||||||||||||||
| 内容記述 | Many recent reports on the critical current density (Jc) in superconducting MgB2 bulks indicated that improving the grain connectivity is important, since the obtained Jc values were generally much lower than those in other metallic superconductors and it was ascribed to the poor connectivity between grains in polycrystalline MgB2. In this study, we focused on the estimation of the global critical current density, super-current path, grain connectivity and their relationships with the faults volume fraction in the MgB2 bulks prepared by a modified PIT (powder in tube) method. Campbell’s method was applied for the purpose of obtaining the penetrating AC flux profile and the characteristic of AC magnetic field vs. penetration depth from the sample’s surface. A computer simulation on the penetrating AC flux profile in MgB2 bulks with randomly distributed voids, oxidized grains and other faults was also carried out. Jc obtained by Campbell’s method turned out to be smaller than that obtained from the SQUID measurement, implying that the global super-current was reduced by the existence of various faults and the lack of the electrical connectivity. It was verified that the relationship between the global critical current characteristics and the faults contained in MgB2 samples can be quantitatively clarified by comparing the simulated critical current densities and other factors with the experimental results. | |||||||||||||||||||||
| 言語 | en | |||||||||||||||||||||
| 書誌情報 |
en : Physica C: Superconductivity and its Applications 巻 468, 号 15-20, p. 1443-1446, 発行日 2008-09-15 |
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| 出版社 | ||||||||||||||||||||||
| 出版者 | Elsevier | |||||||||||||||||||||
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| 関連タイプ | isVersionOf | |||||||||||||||||||||
| 識別子タイプ | DOI | |||||||||||||||||||||
| 関連識別子 | https://doi.org/10.1016/j.physc.2008.05.242 | |||||||||||||||||||||
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| 収録物識別子タイプ | PISSN | |||||||||||||||||||||
| 収録物識別子 | 0921-4534 | |||||||||||||||||||||
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| 収録物識別子タイプ | EISSN | |||||||||||||||||||||
| 収録物識別子 | 1873-2143 | |||||||||||||||||||||
| 著作権関連情報 | ||||||||||||||||||||||
| 権利情報 | Copyright © 2008 Elsevier B.V. All rights reserved. | |||||||||||||||||||||
| キーワード | ||||||||||||||||||||||
| 主題Scheme | Other | |||||||||||||||||||||
| 主題 | Polycrystalline MgB2 bulk | |||||||||||||||||||||
| キーワード | ||||||||||||||||||||||
| 主題Scheme | Other | |||||||||||||||||||||
| 主題 | Campbell’s method | |||||||||||||||||||||
| キーワード | ||||||||||||||||||||||
| 主題Scheme | Other | |||||||||||||||||||||
| 主題 | AC flux profile | |||||||||||||||||||||
| キーワード | ||||||||||||||||||||||
| 主題Scheme | Other | |||||||||||||||||||||
| 主題 | Grain connectivity | |||||||||||||||||||||
| 出版タイプ | ||||||||||||||||||||||
| 出版タイプ | AM | |||||||||||||||||||||
| 出版タイプResource | http://purl.org/coar/version/c_ab4af688f83e57aa | |||||||||||||||||||||
| 査読の有無 | ||||||||||||||||||||||
| 値 | yes | |||||||||||||||||||||
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| 値 | DDCCA6142EF9684949257600002C4CC3 | |||||||||||||||||||||
