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Properties of {\rm MgB}_{2} Tapes Prepared by Using MA In-Ex Situ Powder

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11 Author(s)
Kario, A. ; Inst. for Metallic Mater., IFW Dresden, Dresden, Germany ; Hasler, W. ; Herrmann, M. ; Rodig, C.
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MgB2 single-filament tapes and wires with Monel/Nb sheath were produced by the Powder in Tube (PIT)-technique using MA in-ex situ powder. This powder prepared by mechanical alloying (MA) of Mg and B was finally reacted to MgB2 at 700??C. The amount of MgB2 after annealing was about 91 wt%. Additionally 9 wt% MgO secondary phase was found. The primary crystallite size was about 25 nm. Critical current density measurements have shown relatively high values of Jc = 104 A/cm2 at 6.7 T for unsintered tapes in parallel magnetic field. Heat treatment at temperatures of up to 900??C could not improve these values, probably due to MgO hindering the sintering process.

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Applied Superconductivity, IEEE Transactions on  (Volume:20 ,  Issue: 3 )