The preparation of high transition temperature superconducting Pb-Bi-Ge alloy filaments using the method of glass-coated melt spinning |
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Authors: | Gotō Tomoko Waku Naoto |
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Affiliation: | (1) Nagoya Institute of Technology, Gokiso-ch , Sh wa-ku, 466 Nagoya, Japan |
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Abstract: | The melt spinning of Pb-Bi-Ge alloys with Pyrex glass was investigated as a means of producing a superconducting long filament with highT
c. Continuous filaments with maximumT
c of more than 10 K of Pb100-x-y
Bi
x
Ge
y
(15 x 37 and 7![les](/content/r03q676l71u85054/xxlarge10877.gif) 25) were obtained from the molten state at 1500 K with a winding speed of 0.95 m sec–1. The Pb49Bi33Ge18 filament, which was 34×10–6 m diameter and a ductile material with a tensile strength of 20 MPa and elongation of 2.7%, exhibited superconductivity at the highestT
c of 14.3 K. These filaments were found to be polycrystalline with a grain size of more than 5000×10–10 m and had a mixed structure of germanium (diamond) (h c p) and bismuth phases. The germanium element distributed homogeneously in the filament. |
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Keywords: | |
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