Anisotropy of the critical current in MgB2 tapes made of high energy milled precursor powder
For applications of MgB2 wires or tapes, high critical currents in high magnetic fields are essential. By using tapes in superconducting coils the anisotropic behaviour of the critical current, i.e. the dependence on the direction of the external field in relation to the tape surface, has to be take...
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| Veröffentlicht in: | Superconductor science & technology 2010-06, Vol.23 (6), p.065011-065011 |
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| container_title | Superconductor science & technology |
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| creator | Häßler, W Kovac, P Eisterer, M Abrahamsen, A B Herrmann, M Rodig, C Nenkov, K Holzapfel, B Melisek, T Kulich, M v Zimmermann, M Bednarcik, J Grivel, J C |
| description | For applications of MgB2 wires or tapes, high critical currents in high magnetic fields are essential. By using tapes in superconducting coils the anisotropic behaviour of the critical current, i.e. the dependence on the direction of the external field in relation to the tape surface, has to be taken into account. The anisotropy of MgB2 tapes with mechanically alloyed (MA) precursor powder and different sheath materials which can be much higher than the intrinsic anisotropy is discussed. Furthermore tapes with pure and C doped MA-MgB2 precursor are compared. Tapes with a hard Fe-sheath and undoped precursor show a high extrinsic anisotropy of the critical current density which can be reduced considerably by carbon doping. A texture of the MgB2 phase in the tape filaments introduced by flat rolling was observed by synchrotron x-ray diffraction. Using this texture information the observed macroscopic Ic-anisotropy of the tapes can be explained by calculations based on the percolation model. |
| doi_str_mv | 10.1088/0953-2048/23/6/065011 |
| format | Article |
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By using tapes in superconducting coils the anisotropic behaviour of the critical current, i.e. the dependence on the direction of the external field in relation to the tape surface, has to be taken into account. The anisotropy of MgB2 tapes with mechanically alloyed (MA) precursor powder and different sheath materials which can be much higher than the intrinsic anisotropy is discussed. Furthermore tapes with pure and C doped MA-MgB2 precursor are compared. Tapes with a hard Fe-sheath and undoped precursor show a high extrinsic anisotropy of the critical current density which can be reduced considerably by carbon doping. A texture of the MgB2 phase in the tape filaments introduced by flat rolling was observed by synchrotron x-ray diffraction. Using this texture information the observed macroscopic Ic-anisotropy of the tapes can be explained by calculations based on the percolation model.</description><identifier>ISSN: 0953-2048</identifier><identifier>EISSN: 1361-6668</identifier><identifier>DOI: 10.1088/0953-2048/23/6/065011</identifier><language>eng</language><publisher>Bristol: IOP Publishing</publisher><subject>Anisotropy ; Applied sciences ; Borides ; Carbon ; Condensed matter: electronic structure, electrical, magnetic, and optical properties ; Critical currents ; Electrical engineering. 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By using tapes in superconducting coils the anisotropic behaviour of the critical current, i.e. the dependence on the direction of the external field in relation to the tape surface, has to be taken into account. The anisotropy of MgB2 tapes with mechanically alloyed (MA) precursor powder and different sheath materials which can be much higher than the intrinsic anisotropy is discussed. Furthermore tapes with pure and C doped MA-MgB2 precursor are compared. Tapes with a hard Fe-sheath and undoped precursor show a high extrinsic anisotropy of the critical current density which can be reduced considerably by carbon doping. A texture of the MgB2 phase in the tape filaments introduced by flat rolling was observed by synchrotron x-ray diffraction. Using this texture information the observed macroscopic Ic-anisotropy of the tapes can be explained by calculations based on the percolation model.</description><subject>Anisotropy</subject><subject>Applied sciences</subject><subject>Borides</subject><subject>Carbon</subject><subject>Condensed matter: electronic structure, electrical, magnetic, and optical properties</subject><subject>Critical currents</subject><subject>Electrical engineering. Electrical power engineering</subject><subject>Exact sciences and technology</subject><subject>Intermetallic compounds</subject><subject>Magnesium compounds</subject><subject>Materials</subject><subject>Physics</subject><subject>Precursors</subject><subject>Properties of type I and type II superconductors</subject><subject>Superconducting tapes</subject><subject>Superconductivity</subject><subject>Superconductors</subject><subject>Surface layer</subject><subject>Texture</subject><issn>0953-2048</issn><issn>1361-6668</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2010</creationdate><recordtype>article</recordtype><recordid>eNpt0U1LAzEQBuAgCtbqTxByES-uO8lssumxFr-g4kVvQkiz2TayXyZbpP_eXVq86GkO88zAvEPIJYNbBkqlMBOYcMhUyjGVKUgBjB2RCUPJEimlOiaTX3NKzmL8hEEo5BPyMW98bPvQdjvalrTfOGqD7701FbXbEFzTU9_Ql_Udp73pXKS1KdxIN369oa5xYb2jta8qV9AuuGEmtoF27Xfhwjk5KU0V3cWhTsn7w_3b4ilZvj4-L-bLxPOZ6BOxEpnjYDmWxhSAq1mOXOYSwPAcwQLYcsVcmSkLQlqZZ1KgNYwjc5BhgVNyvd_bhfZr62Kvax-tqyrTuHYbtRIiB8QZG-TVQZo4nFgG01gfdRd8bcJOc65EnmU4uJu982332x0z1GOGmqOWep-z7opy4PCXM9Dje_4fwx9wPH9M</recordid><startdate>20100601</startdate><enddate>20100601</enddate><creator>Häßler, W</creator><creator>Kovac, P</creator><creator>Eisterer, M</creator><creator>Abrahamsen, A B</creator><creator>Herrmann, M</creator><creator>Rodig, C</creator><creator>Nenkov, K</creator><creator>Holzapfel, B</creator><creator>Melisek, T</creator><creator>Kulich, M</creator><creator>v Zimmermann, M</creator><creator>Bednarcik, J</creator><creator>Grivel, J C</creator><general>IOP Publishing</general><general>Institute of Physics</general><scope>IQODW</scope><scope>7QF</scope><scope>7U5</scope><scope>8BQ</scope><scope>8FD</scope><scope>JG9</scope><scope>L7M</scope></search><sort><creationdate>20100601</creationdate><title>Anisotropy of the critical current in MgB2 tapes made of high energy milled precursor powder</title><author>Häßler, W ; Kovac, P ; Eisterer, M ; Abrahamsen, A B ; Herrmann, M ; Rodig, C ; Nenkov, K ; Holzapfel, B ; Melisek, T ; Kulich, M ; v Zimmermann, M ; Bednarcik, J ; Grivel, J C</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-i295t-5b54e20c23faad03b973267600a2730c00cfb1ef48c056c674653ca1231e043d3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2010</creationdate><topic>Anisotropy</topic><topic>Applied sciences</topic><topic>Borides</topic><topic>Carbon</topic><topic>Condensed matter: electronic structure, electrical, magnetic, and optical properties</topic><topic>Critical currents</topic><topic>Electrical engineering. 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| source | Institute of Physics Journals |
| subjects | Anisotropy Applied sciences Borides Carbon Condensed matter: electronic structure, electrical, magnetic, and optical properties Critical currents Electrical engineering. Electrical power engineering Exact sciences and technology Intermetallic compounds Magnesium compounds Materials Physics Precursors Properties of type I and type II superconductors Superconducting tapes Superconductivity Superconductors Surface layer Texture |
| title | Anisotropy of the critical current in MgB2 tapes made of high energy milled precursor powder |
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