Enhancement of critical currents in bulk and Ag-sheathed Bi(Pb)-2223 superconductors
| Autor: | D.J. Brauer, R. Eujen, J. Hudepohl |
|---|---|
| Rok vydání: | 1991 |
| Předmět: |
Superconductivity
Materials science High-temperature superconductivity Condensed matter physics Annealing (metallurgy) Analytical chemistry Electronic Optical and Magnetic Materials law.invention Magnetic field law Electrical resistivity and conductivity Bulk samples Electrical and Electronic Engineering Electric current Chemical composition |
| Zdroj: | IEEE Transactions on Magnetics. 27:1105-1107 |
| ISSN: | 1941-0069 0018-9464 |
| DOI: | 10.1109/20.133374 |
| Popis: | The superconducting properties of the Bi(Pb)-2223 phase have been optimized. Prolonged annealing of coarse powder raised the j/sub c/ in bulk samples to as high as 1100 A-cm/sup -2/ at 77 K. The temperature dependence between 96 and 4.2 K was studied, where j/sub c/ rose gradually from 120 to 2100 A-cm/sup -2/. T/sub c/ dropped from 107 K to 64 K in magnetic fields up to 4 T, but decreased by only 1 K/T in higher fields. A tape prepared by rolling and subsequent annealing of Ag tubes containing Bi(Pb)2223 powder exhibited a j/sub c/ of 1700 A-cm/sup -2/ at 77 K and 11000 A-cm/sup -2/ at 4.2 K. The latter j/sub c/ dropped to 3000 A-cm/sup -2/ in a magnetic field of 0.25 T, but it was still 1200 A-cm/sup -2/ in a 10-T field. A tape fabricated by pressing a drawn and annealed wire proved to be less sensitive to low magnetic fields. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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