Reduction of AC losses applying novel resistive interfilamentary carbonate barriers in multifilamentary Bi(2223) tapes |
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Authors: | W Goldacker M Quilitz B Obst H Eckelmann |
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Institution: | Forschungszentrum Karlsruhe, Institut für Technische Physik, P.O. Box 3640, D-76021 Karlsruhe, Germany |
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Abstract: | Hysteresis losses and coupling losses, a main component of the AC losses in Bi(2223) tapes, can effectively be reduced by enhancing the resistivity of the matrix material between the filaments and applying a filament twist. Since through alloying the sheath, as using AgAu(8 wt.%), the resistivity can only be raised by a factor <10 (77 K), a new conductor configuration with a quite novel composite matrix having resistive SrCO3 barriers inside the Ag matrix between the filaments was developed. These new barriers, a cheap and commercial material, withstand the tape annealing, do not react with the superconductor, sinter dense and have a good bonding to Ag. Applying two different preparation techniques for 19 filament prototype tapes, critical current densities up to 20.7 kA cm?2 were achieved. We report on tape preparation, the effect on the phase texture and the superconducting properties of such barrier tapes. |
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Keywords: | Bi-2223 tape Resistive barrier Magnetic AC loss AgAu SrCO3 |
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