Comparative study on the critical current density of MgB2 prepared by mixed boron powders

Polycrystalline MgB2 was prepared from Mg and boron precursors consisting of boron powders with varying purity and form. Tc does not change largely for all samples. By replacing 10 wt.% of high purity amorphous boron with impure crystalline boron, comparable Jc to that of samples prepared from high...

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Main Authors: Chen, Soo Kien, Lim, Kean Pah, Tan, Kar Ban, Shaari, Abdul Halim
Format: Article
Language:English
Published: Malaysian Solid State Science and Technology Society 2009
Online Access:http://psasir.upm.edu.my/id/eprint/13674/1/Comparative%20study%20on%20the%20critical%20current%20density%20of%20MgB2%20prepared%20by%20mixed%20boron%20powders.pdf
http://psasir.upm.edu.my/id/eprint/13674/
http://journal.masshp.net/volume-17-no-1-2009/
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spelling my.upm.eprints.136742015-11-04T01:08:43Z http://psasir.upm.edu.my/id/eprint/13674/ Comparative study on the critical current density of MgB2 prepared by mixed boron powders Chen, Soo Kien Lim, Kean Pah Tan, Kar Ban Shaari, Abdul Halim Polycrystalline MgB2 was prepared from Mg and boron precursors consisting of boron powders with varying purity and form. Tc does not change largely for all samples. By replacing 10 wt.% of high purity amorphous boron with impure crystalline boron, comparable Jc to that of samples prepared from high purity amorphous boron powder alone can be obtained. High Jc can also be retained by replacing 20 wt.% of the high purity amorphous boron with impure amorphous boron. However, Jc decreases more rapidly with field by increasing the proportion of impure amorphous boron. By mixing both impure amorphous and crystalline boron powders even up to the proportion of 50 ¨C 50 wt.%, the obtained MgB2 exhibit enhanced Jc compared to samples prepared from the respective boron powder alone. The enhancement in Jc at 6K and 20K is more pronounced for applied field ≤ 3T. Malaysian Solid State Science and Technology Society 2009 Article PeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/13674/1/Comparative%20study%20on%20the%20critical%20current%20density%20of%20MgB2%20prepared%20by%20mixed%20boron%20powders.pdf Chen, Soo Kien and Lim, Kean Pah and Tan, Kar Ban and Shaari, Abdul Halim (2009) Comparative study on the critical current density of MgB2 prepared by mixed boron powders. Solid State Science and Technology, 17 (1). pp. 173-181. ISSN 0128-7389 http://journal.masshp.net/volume-17-no-1-2009/
institution Universiti Putra Malaysia
building UPM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Putra Malaysia
content_source UPM Institutional Repository
url_provider http://psasir.upm.edu.my/
language English
description Polycrystalline MgB2 was prepared from Mg and boron precursors consisting of boron powders with varying purity and form. Tc does not change largely for all samples. By replacing 10 wt.% of high purity amorphous boron with impure crystalline boron, comparable Jc to that of samples prepared from high purity amorphous boron powder alone can be obtained. High Jc can also be retained by replacing 20 wt.% of the high purity amorphous boron with impure amorphous boron. However, Jc decreases more rapidly with field by increasing the proportion of impure amorphous boron. By mixing both impure amorphous and crystalline boron powders even up to the proportion of 50 ¨C 50 wt.%, the obtained MgB2 exhibit enhanced Jc compared to samples prepared from the respective boron powder alone. The enhancement in Jc at 6K and 20K is more pronounced for applied field ≤ 3T.
format Article
author Chen, Soo Kien
Lim, Kean Pah
Tan, Kar Ban
Shaari, Abdul Halim
spellingShingle Chen, Soo Kien
Lim, Kean Pah
Tan, Kar Ban
Shaari, Abdul Halim
Comparative study on the critical current density of MgB2 prepared by mixed boron powders
author_facet Chen, Soo Kien
Lim, Kean Pah
Tan, Kar Ban
Shaari, Abdul Halim
author_sort Chen, Soo Kien
title Comparative study on the critical current density of MgB2 prepared by mixed boron powders
title_short Comparative study on the critical current density of MgB2 prepared by mixed boron powders
title_full Comparative study on the critical current density of MgB2 prepared by mixed boron powders
title_fullStr Comparative study on the critical current density of MgB2 prepared by mixed boron powders
title_full_unstemmed Comparative study on the critical current density of MgB2 prepared by mixed boron powders
title_sort comparative study on the critical current density of mgb2 prepared by mixed boron powders
publisher Malaysian Solid State Science and Technology Society
publishDate 2009
url http://psasir.upm.edu.my/id/eprint/13674/1/Comparative%20study%20on%20the%20critical%20current%20density%20of%20MgB2%20prepared%20by%20mixed%20boron%20powders.pdf
http://psasir.upm.edu.my/id/eprint/13674/
http://journal.masshp.net/volume-17-no-1-2009/
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score 13.222552