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Doping Effect on Partial-Melting of HgxBa2Ca2Cu3Re0.2Oy Filament

  • T. Goto
  • M. Konishi
  • M. Tonomura
Part of the Advances in Cryogenic Engineering book series (ACRE, volume 44)

Abstract

We have studied the fabrication of filamentary Fig system superconductor using a solution spinning method with Re addition. A controlled vapor/solid reaction process is necessary for preparing Hg-based superconductor by this method. As the F-doping resulted in a dense liquidus texture, F and Cl doping effects on partial-melting of filamentary Hg x Ba2Ca2Cu3Re0.2O y superconductor are examined to enhance the J c and to reduce the inciting temperature. A filamentary Ba2Ca2Cu3Re0.2O y precursor was spun by a solution spinning method and partially melted in an evacuated quartz tube with a pellet as a reactor. Hg1Ba1.8Ca2Cu3Re0.2(BaF2)0.2O y , Hg0.8Ba1.8Ca2Cu3Re0.2(BaF2)0.2O y , Hg1Ba2Ca2Cu2.8Re0.2(CuF2)0.2O y , Hg0.925Ba2Ca2Cu3Re0.2(HgCl2)0.075O y and Hg0.8Ba1.8Ca2Cu3Re0.2(BaF2)0.2(HgCl2)0.03O y pellets were prepared by a two-step solid state reaction method.

The partial-inelting temperature of the filamentary sample reacted with Hg1Ba2Ca2Cu2.8Re0.2(CuF2)0.2O y pellet was lower than others. The texture of the filamentary sample was dependent on the vaporizing materials. The J c of the sample was enhanced by post-annealing up to 350 °C in O2 flow. By controlling the heating condition, a high J c value more than 104 A/cm2 at 77 K and 0 T was attained for both F and Cl doped sample.

Keywords

Vapor Source Doping Source Evacuate Quartz Tube Ammonium Perrhenate Detail Phase Diagram 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 1998

Authors and Affiliations

  • T. Goto
    • 1
  • M. Konishi
    • 1
  • M. Tonomura
    • 1
  1. 1.Nagoya Institute of TechnologyNagoya, 466Japan

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