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

B. J. Senkowicz; R. J. Mungall; Ye Zhu; J. Jiang; P. M. Voyles; E. E. Hellstrom; D. C. Larbalestier

doi:10.1088/0953-2048/21/3/035009

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

B. J. Senkowicz, R. J. Mungall, Ye Zhu, J. Jiang, P. M. Voyles, E. E. Hellstrom, D. C. Larbalestier

Research output: Journal article publication › Journal article › Academic research › peer-review

82 Citations (Scopus)

Abstract

Magnesium diboride (MgB2) powder was mechanically alloyed by high-energy ball milling with C to a composition of Mg(B0.95C 0.05)2 and then sintered at 1000 °C in a hot isostatic press. Milling times varied from 1 to 3000min. Full C incorporation required only 30-60min of milling. The grain size of sintered samples decreased with increased milling time to <30nm for 20-50h of milling. Milling had a weak detrimental effect on the connectivity. A strong irreversibility field (H *) increase (from 13.3 to 17.2T at 4.2K) due to increased milling time was observed and correlated linearly with inverse grain size (1/d). As a result, the high-field Jc benefited greatly from lengthy powder milling. Jc (8T, 4.2K) peaked at>80 000Acm-2 with 1200min of milling compared with only ∼26 000Acm-2 for 60min 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.

Original language	English
Article number	035009
Journal	Superconductor Science and Technology
Volume	21
Issue number	3
DOIs	https://doi.org/10.1088/0953-2048/21/3/035009
Publication status	Published - 1 Mar 2008
Externally published	Yes

ASJC Scopus subject areas

Ceramics and Composites
Condensed Matter Physics
Metals and Alloys
Materials Chemistry
Electrical and Electronic Engineering

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10.1088/0953-2048/21/3/035009

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Senkowicz, B. J., Mungall, R. J., Zhu, Y., Jiang, J., Voyles, P. M., Hellstrom, E. E., & Larbalestier, D. C. (2008). Nanoscale grains, high irreversibility field and large critical current density as a function of high-energy ball milling time in C-doped magnesium diboride. Superconductor Science and Technology, 21(3), Article 035009. https://doi.org/10.1088/0953-2048/21/3/035009

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Nanoscale grains, high irreversibility field and large critical current density as a function of high-energy ball milling time in C-doped magnesium diboride. / Senkowicz, B. J.; Mungall, R. J.; Zhu, Ye et al.
In: Superconductor Science and Technology, Vol. 21, No. 3, 035009, 01.03.2008.

Research output: Journal article publication › Journal article › Academic research › peer-review

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AU - Zhu, Ye

AU - Jiang, J.

AU - Voyles, P. M.

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AU - Larbalestier, D. C.

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AB - Magnesium diboride (MgB2) powder was mechanically alloyed by high-energy ball milling with C to a composition of Mg(B0.95C 0.05)2 and then sintered at 1000 °C in a hot isostatic press. Milling times varied from 1 to 3000min. Full C incorporation required only 30-60min of milling. The grain size of sintered samples decreased with increased milling time to <30nm for 20-50h of milling. Milling had a weak detrimental effect on the connectivity. A strong irreversibility field (H *) increase (from 13.3 to 17.2T at 4.2K) due to increased milling time was observed and correlated linearly with inverse grain size (1/d). As a result, the high-field Jc benefited greatly from lengthy powder milling. Jc (8T, 4.2K) peaked at>80 000Acm-2 with 1200min of milling compared with only ∼26 000Acm-2 for 60min 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.

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

Abstract

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