High critical current properties of MgB2 bulks prepared by a diffusion method -: art. no. 222502

被引：56

作者：

Ueda, S ^{[1
]}

Shimoyama, J ^{[1
]}

Iwayama, I ^{[1
]}

Yamamoto, A ^{[1
]}

Katsura, Y ^{[1
]}

Horii, S ^{[1
]}

Kishio, K ^{[1
]}

机构：

[1] Univ Tokyo, Dept Superconductiv, Bunkyo Ku, Tokyo 1130033, Japan

来源：

APPLIED PHYSICS LETTERS | 2005年 / 86卷 / 22期

关键词：

D O I：

10.1063/1.1939071

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Highly dense MgB2 bulks with high purity were synthesized by the newly developed PICT-diffusion method, starting from magnesium and boron which were separately packed in sealed stainless tubes. Critical current density, J(c), systematically improved with a decrease of grain size of the samples. A sample reacted at 800 degrees C for 60 h exhibited the highest J(c) of similar to 0.86 MA/cm(2) at 20 K in self-field, which was almost three times higher than that of conventional porous MgB2 bulks prepared by the solid-state reaction. Besides an increase of effective current pass, small grains with 30-100 nm in size and good grain connectivity resulted in the dramatically enhanced J(c). (c) 2005 American Institute of Physics.

引用

页码：1 / 3

页数：3

共 9 条

[1] 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

[2] Enhancement of the critical current density and flux pinning of MgB2 superconductor by nanoparticle SIC doping [J].

Dou, SX ;

Soltanian, S ;

Horvat, J ;

Wang, XL ;

Zhou, SH ;

Ionescu, M ;

Liu, HK ;

Munroe, P ;

Tomsic, M .

APPLIED PHYSICS LETTERS, 2002, 81 (18) :3419-3421

[3]

GOLEACKER W, 2004, SUPERCOND SCI TECH, V17, pS363

[4] Effect of SiO2 and SiC doping on the powder-in-tube processed MgB2 tapes [J].

Matsumoto, A ;

Kumakura, H ;

Kitaguchi, H ;

Hatakeyama, H .

SUPERCONDUCTOR SCIENCE & TECHNOLOGY, 2003, 16 (08) :926-930

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

Nagamatsu, J ;

Nakagawa, N ;

Muranaka, T ;

Zenitani, Y ;

Akimitsu, J .

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

[6] Synthesis of high Jc MgB2 bulks with high reproducibility by a modified powder-in-tube method [J].

Yamamoto, A ;

Shimoyama, JI ;

Ueda, S ;

Katsura, Y ;

Horii, S ;

Kishio, K .

SUPERCONDUCTOR SCIENCE & TECHNOLOGY, 2004, 17 (07) :921-925

[7] Improved critical current properties observed in MgB2 bulks synthesized by low-temperature solid-state reaction [J].

Yamamoto, A ;

Shimoyama, J ;

Ueda, S ;

Katsura, Y ;

Horii, S ;

Kishio, K .

SUPERCONDUCTOR SCIENCE & TECHNOLOGY, 2005, 18 (01) :116-121

[8]

YAMAMOTO A, IN PRESS APPL PHYS L

[9]

2001A000978

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