Strong Enhancement of Critical Current Density in MgB2 Bulk and Ni-Sheathed Tapes With Very Small Dy2O3 Additions
A series of polycrystalline samples were prepared by in situ reaction of Dy2O3 (0.5-5.0 wt.%) with Mg + B. While the superconducting transition temperature, Tc remained largely unchanged, the intragrain distribution of nano precipitates of DyB4 and MgO led to strong enhancement in critical current d...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English English |
| Published: |
Institute of Electrical and Electronics Engineers
2007
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| Online Access: | http://psasir.upm.edu.my/id/eprint/7442/1/Strong%20Enhancement%20of%20Critical%20Current%20Density%20in%20MgB2%20Bulk%20and%20Ni.pdf |
| _version_ | 1796967327697207296 |
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| author | Chen, Soo Kien Wei, M. Grasso, G. Malagoli, A. Braccini, V. MacManus Driscoll, Judith L. |
| author_facet | Chen, Soo Kien Wei, M. Grasso, G. Malagoli, A. Braccini, V. MacManus Driscoll, Judith L. |
| author_sort | Chen, Soo Kien |
| collection | UPM |
| description | A series of polycrystalline samples were prepared by in situ reaction of Dy2O3 (0.5-5.0 wt.%) with Mg + B. While the superconducting transition temperature, Tc remained largely unchanged, the intragrain distribution of nano precipitates of DyB4 and MgO led to strong enhancement in critical current density, Jc at lower field below 4 T. The best sample (with only 0.5 wt.% Dy2O3 additions) had a Jc (1 T) of around a factor of 4 higher compared to the pure sample at 6 K and 20 K indicating improved connectivity and pinning. On the other hand, ex situ Ni-sheathed tapes fabricated from the Dy2O3 added powders exhibited critical current, Ic (4.2 K) superior to those made from pure MgB2 powders at higher field above 3 T. The former also showed lower anisotropy in Ic with respect to field direction. |
| first_indexed | 2024-03-06T07:12:15Z |
| format | Article |
| id | upm.eprints-7442 |
| institution | Universiti Putra Malaysia |
| language | English English |
| last_indexed | 2024-03-06T07:12:15Z |
| publishDate | 2007 |
| publisher | Institute of Electrical and Electronics Engineers |
| record_format | dspace |
| spelling | upm.eprints-74422015-11-27T01:47:47Z http://psasir.upm.edu.my/id/eprint/7442/ Strong Enhancement of Critical Current Density in MgB2 Bulk and Ni-Sheathed Tapes With Very Small Dy2O3 Additions Chen, Soo Kien Wei, M. Grasso, G. Malagoli, A. Braccini, V. MacManus Driscoll, Judith L. A series of polycrystalline samples were prepared by in situ reaction of Dy2O3 (0.5-5.0 wt.%) with Mg + B. While the superconducting transition temperature, Tc remained largely unchanged, the intragrain distribution of nano precipitates of DyB4 and MgO led to strong enhancement in critical current density, Jc at lower field below 4 T. The best sample (with only 0.5 wt.% Dy2O3 additions) had a Jc (1 T) of around a factor of 4 higher compared to the pure sample at 6 K and 20 K indicating improved connectivity and pinning. On the other hand, ex situ Ni-sheathed tapes fabricated from the Dy2O3 added powders exhibited critical current, Ic (4.2 K) superior to those made from pure MgB2 powders at higher field above 3 T. The former also showed lower anisotropy in Ic with respect to field direction. Institute of Electrical and Electronics Engineers 2007 Article PeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/7442/1/Strong%20Enhancement%20of%20Critical%20Current%20Density%20in%20MgB2%20Bulk%20and%20Ni.pdf Chen, Soo Kien and Wei, M. and Grasso, G. and Malagoli, A. and Braccini, V. and MacManus Driscoll, Judith L. (2007) Strong Enhancement of Critical Current Density in MgB2 Bulk and Ni-Sheathed Tapes With Very Small Dy2O3 Additions. IEEE Transactions on Applied Superconductivity, 17 (2). pp. 2786-2789. ISSN 1051-8223 http://dx.doi.org/10.1109/TASC.2007.898228 10.1109/TASC.2007.898228 English |
| spellingShingle | Chen, Soo Kien Wei, M. Grasso, G. Malagoli, A. Braccini, V. MacManus Driscoll, Judith L. Strong Enhancement of Critical Current Density in MgB2 Bulk and Ni-Sheathed Tapes With Very Small Dy2O3 Additions |
| title | Strong Enhancement of Critical Current Density in MgB2 Bulk and Ni-Sheathed Tapes With Very Small Dy2O3 Additions |
| title_full | Strong Enhancement of Critical Current Density in MgB2 Bulk and Ni-Sheathed Tapes With Very Small Dy2O3 Additions |
| title_fullStr | Strong Enhancement of Critical Current Density in MgB2 Bulk and Ni-Sheathed Tapes With Very Small Dy2O3 Additions |
| title_full_unstemmed | Strong Enhancement of Critical Current Density in MgB2 Bulk and Ni-Sheathed Tapes With Very Small Dy2O3 Additions |
| title_short | Strong Enhancement of Critical Current Density in MgB2 Bulk and Ni-Sheathed Tapes With Very Small Dy2O3 Additions |
| title_sort | strong enhancement of critical current density in mgb2 bulk and ni sheathed tapes with very small dy2o3 additions |
| url | http://psasir.upm.edu.my/id/eprint/7442/1/Strong%20Enhancement%20of%20Critical%20Current%20Density%20in%20MgB2%20Bulk%20and%20Ni.pdf |
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