High critical current density in MgB2/Fe wires

被引：13

作者：

Feng, Y

Yan, G

Zhao, Y

Wu, XJ

Pradhan, AK

Zhang, X

Liu, CF

Liu, XH

Zhou, L

机构：

[1] NW Inst Nonferrous Met Res, Xian 710016, Peoples R China

[2] Univ New S Wales, Sch Mat Sci & Engn, Sydney, NSW 2052, Australia

[3] Fudan Univ, Natl Microanal Ctr, Shanghai 200433, Peoples R China

[4] Univ Virginia, Jesse W Beams Lab, Charlottesville, VA 22901 USA

来源：

SUPERCONDUCTOR SCIENCE & TECHNOLOGY | 2003年 / 16卷 / 06期

关键词：

D O I：

10.1088/0953-2048/16/6/304

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

High-quality monofilamentary MgB2 wires with Fe sheath were fabricated by the powder-in-tube (PIT) method at ambient pressure. The phase compositions, microstructure features and flux pinning properties are investigated by using x-ray diffractometer, SEM, TEM and a standard four-probe technique. It is found that MgB2 has no reaction with Fe. The results indicate that MgB2 wires are dense and only MgB2 and few MgO phases exist in the core area. MgB2/Fe wires exhibit very high transport critical current densities of 1.43 x 10(5) A cm(-2) (4.2 K, 4 T), 2.8 x 10(4) A cm(-2) (4.2 K, 6 T), 3.72 x 10(4) A cm(-2) (15 K, 4 T) and 2.34 x 10(4) A cm(-2) (25 K, 3 T). The maximum flux pinning force shows a peak at 4 T at 4.2 K, suggesting strong pinning at high fields. The reasons for the large J(c) in the sample was also discussed.

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收藏

页码：682 / 684

页数：3

相关论文

共 12 条

[1]

BENEDUCE C, 2002, CONDMAT0203551

[2] Superconductivity in dense MgB2 wires [J].

Canfield, PC ;

Finnemore, DK ;

Bud'ko, SL ;

Ostenson, JE ;

Lapertot, G ;

Cunningham, CE ;

Petrovic, C .

PHYSICAL REVIEW LETTERS, 2001, 86 (11) :2423-2426

[3] Substitution-induced pinning in MgB2 superconductor doped with SiC nano-particles [J].

Dou, SX ;

Pan, AV ;

Zhou, S ;

Ionescu, M ;

Liu, HK ;

Munroe, PR .

SUPERCONDUCTOR SCIENCE & TECHNOLOGY, 2002, 15 (11) :1587-1591

[4] High transport currents in mechanically reinforced MgB2 wires [J].

Goldacker, W ;

Schlachter, SI ;

Zimmer, S ;

Reiner, H .

SUPERCONDUCTOR SCIENCE & TECHNOLOGY, 2001, 14 (09) :787-793

[5] Large transport critical currents in unsintered MgB2 superconducting tapes [J].

Grasso, G ;

Malagoli, A ;

Ferdeghini, C ;

Roncallo, S ;

Braccini, V ;

Siri, AS ;

Cimberle, MR .

APPLIED PHYSICS LETTERS, 2001, 79 (02) :230-232

[6] Improvement of critical current in MgB2/Fe superconducting wires by a ferromagnetic sheath [J].

Horvat, J ;

Wang, XL ;

Soltanian, S ;

Dou, SX .

APPLIED PHYSICS LETTERS, 2002, 80 (05) :829-831

[7] Approach for the fabrication of MgB2 superconducting tape with large in-field transport critical current density [J].

Komori, K ;

Kawagishi, K ;

Takano, Y ;

Fujii, H ;

Arisawa, S ;

Kumakura, H ;

Fukutomi, M ;

Togano, K .

APPLIED PHYSICS LETTERS, 2002, 81 (06) :1047-1049

[8] Structure, grain connectivity and pinning of as-deformed commercial MgB2 powder in Cu and Fe/Cu sheaths [J].

Kovác, P ;

Husek, I ;

Pachla, W ;

Melisek, T ;

Diduszko, R ;

Frohlich, K ;

Morawski, A ;

Presz, A ;

Machajdik, D .

SUPERCONDUCTOR SCIENCE & TECHNOLOGY, 2002, 15 (07) :1127-1132

[9] Study of Ag and Cu/MgB2 powder-in-tube composite wires fabricated by in situ reaction at low temperatures [J].

Martínez, E ;

Angurel, LA ;

Navarro, R .

SUPERCONDUCTOR SCIENCE & TECHNOLOGY, 2002, 15 (07) :1043-1047

[10] Superconductivity at 39 K in magnesium diboride [J].

Nagamatsu, J ;

Nakagawa, N ;

Muranaka, T ;

Zenitani, Y ;

Akimitsu, J .

NATURE, 2001, 410 (6824) :63-64