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The Influence of Ex Situ MgB_2 Barrier and HIP on the I_c Anisotropy in Double Core MgB_2/Cu Wires

100%
Gajda D., Morawski A., Zaleski A., Cetner T.
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issue 5
1059-1061
EN
The effect of large I_{c} anisotropy reductions in MgB_2/Cu sheathed wire is presented. The measurements of the critical current in rising magnetic field up to 14 T at 4.2 K were performed. Due to the application of the high isostatic pressure process to the copper sheathed MgB_2 wires with the ex situ MgB_2 homo barrier around the in situ core the anisotropy for such wires was very small and approached to less than 2% at magnetic field over 4 T. The presented geometry and technology show several advantages in their practical applications.
2
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Effect of Nano-SiC Doping on the Superconducting Critical Parameters in MgB_2/Fe Wires and Tapes

100%
Gajda D., Zaleski A., Morawski A., Kario A.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
371-374
EN
In this paper the results of critical current measurements for MgB_2 wires and tapes in iron sheath with and without nano-SiC doping are presented. We focus on power-in-tube processing technique, using both in situ and ex situ methods. In situ MgB_2 wires and tapes were fabricated from MgH_2 and B or Mg and B powders. The methods such as hydrostatic extrusion and rolling were used. The samples were annealed under high Ar gas pressure (hot isostatic pressing) at 750°C and 1.0 GPa for 40 min. It was found that critical current of MgB_2/Fe superconducting wire or tape with nano-SiC dopant increased in higher magnetic field values in comparison to pure MgB_2. A significant difference of J_c in tapes made by in situ way from MgH_2 and Mg were found.
3
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Superconducting and Microstructural Properties of (Mg+2B)+MgB_2/Cu Wires Obtained by High Gas Pressure Technology

64%
Kario A., Morawski A., Głowacki B., Łada T., Smaga M., Diduszko R., Kolesnikov D., Zaleski A., Kondrat A., Gajda D.
Acta Physica Polonica A
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2007
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vol. 111
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issue 5
693-703
EN
In order to improve the overall critical current characteristics of Cu sheathed in situ MgB_2 wires a special architecture of the wire, and processing parameters were used. The study presents the influence of the ex situ MgB_2 chemical barrier between ex situ core and Cu, suppressing the reaction of Cu with Mg. Wires, doped with 10 at.% SiC of 18 nm average grain size, were fabricated from MgH_2 and B or from Mg and B powders, using the powder-in-tube method. The methods of rotary swaging or drawing were used as the alternating wire-forming processes. The samples were annealed under high Ar gas pressure (hot isostatic pressing) at 750ºC and 1.0 GPa for 15 and 30 min. A significant difference in Cu distribution across the wires for a long and short time of sintering was observed. The formation of microstructure in the powder-in-tube process and the relationship between the microstructure and critical current density J_c values, are discussed in this paper.
4
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Pinning Force in Superconducting Wires Nb-Ti

64%
Gajda D., Zaleski A., Dyakonov V., Matrosov N., Szymczak H., Beloshenko V., Spuskanyuk V., Chishko V.
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issue 2
364-365
EN
In the paper we present the results of the measurements of critical current I_{c} in NbTi wires. Experiments were made for the wires of 0.3 mm in diameter and the length of 25 mm. The wires were produced by means of two methods: conventional (hydroextrusion and drawing) and preliminary equal channel multiple angle pressing. The samples were heat treated at different temperatures. We describe the influence of different pinning centers on critical current density J_{c}.
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