Nanoscale grains, high irreversibility field and large critical current density as a function of high-energy ball milling time in C-doped magnesium diboride

被引：77

作者：

Senkowicz, B. J. ^{[1
,2
,3
]}

Mungall, R. J. ^{[3
]}

Zhu, Y. ^{[3
]}

Jiang, J. ^{[1
,2
]}

Voyles, P. M. ^{[3
]}

Hellstrom, E. E. ^{[1
,2
,3
]}

Larbalestier, D. C. ^{[1
,2
]}

机构：

[1] Florida State Univ, Ctr Appl Superconduct, Tallahassee, FL 32310 USA

[2] Florida State Univ, Natl High Magnet Field Lab, Tallahassee, FL 32310 USA

[3] Univ Wisconsin Madison, Dept Mat Sci & Engn, Madison, WI 53706 USA

来源：

SUPERCONDUCTOR SCIENCE & TECHNOLOGY | 2008年 / 21卷 / 03期

关键词：

D O I：

10.1088/0953-2048/21/3/035009

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Magnesium diboride (MgB2) powder was mechanically alloyed by high-energy ball milling with C to a composition of Mg(B0.95C0.05)2 and then sintered at 1000 degrees C in a hot isostatic press. Milling times varied from 1 to 3000 min. Full C incorporation required only 30-60 min of milling. The grain size of sintered samples decreased with increased milling time to < 30 nm for 20-50 h of milling. Milling had a weak detrimental effect on the connectivity. A strong irreversibility field (H*) increase ( from 13.3 to 17.2 T at 4.2 K) due to increased milling time was observed and correlated linearly with inverse grain size (1/d). As a result, the high-field J(c) benefited greatly from lengthy powder milling. J(c) ( 8 T, 4.2 K) peaked at > 80 000 A cm(-2) with 1200 min of milling compared with only similar to 26 000 A cm(-2) for 60 min of milling. This non-compositional performance increase is attributed to grain refinement of the unsintered powder by milling, and to the probable suppression of grain growth by milling-induced MgO nanodispersions.

引用

页数：10

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