2004年7月
Annealing effects on structural and superconducting properties of MgB2/Fe wires
MODERN PHYSICS LETTERS B
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- 巻
- 18
- 号
- 16
- 開始ページ
- 791
- 終了ページ
- 802
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1142/S0217984904007323
- 出版者・発行元
- WORLD SCIENTIFIC PUBL CO PTE LTD
We report the results of annealing effects on structural and superconducting properties (T-c and J(c)) of various MgB2/Fe wires that are produced by different conditions. Good quality superconducting MgB2/Fe wires are fabricated by the powder-in-tube (PIT) technique at ambient pressure. XRD data confirms that they are hexagonal MgB2 structure. All the annealed samples show higher T-c values in the range of 34.6-38.4 K with J(c) higher than the as-rolled wire. The annealed samples show significant change in the J(c) values as well as in micro-structural features due to variable sintering temperature. On annealing at 1050degreesC for 10 min, we obtain the best quality sample with a J(c) of 37.2 kA/cm(2) at 33.1 K and self-field with a maximum T-c of 38.4 K. Among the samples annealed at 1050degreesC for 5-20 min, the 20 min sample shows lower J(c). Longer annealing time (at 1050degreesC) reduced J(c), indicating a possible interfacial reaction between the Fe sheath and the MgB2 core.
- リンク情報
- ID情報
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- DOI : 10.1142/S0217984904007323
- ISSN : 0217-9849
- eISSN : 1793-6640
- Web of Science ID : WOS:000223507700003