| Autor: |
Lamine, C., Ben Azouz, F., Badeche, T., Monnereau, O., Ben Salem, M., Boulesteix, C., Lamine, C., Ben Azouz, F., Badeche, T., Monnereau, O., Ben Salem, M., Boulesteix, C. |
| Zdroj: |
Journal de Physique IV - Proceedings; June 1998, Vol. 8 Issue: 1 pPr1-51-Pr1-55, 51155p |
| Abstrakt: |
Superconducting wires are prepared by coating of a silver substrate, by sintering of a slurry deposited onto the metal core and containing a grinded (Pb doped) Bi-2223 ceramic, a grinded Bi-2223/Bi-2212 mixed ceramic or a grinded mixture of the Bi-2223 precursors, and of 20% PbO in excess. The resistance-versus-temperature R(T) curves obtained for a 6 days sintering at 835°C presented only one drop, with Tc0 = 108K (107K when the slurry is a mixture of the Bi-2223 precursors). When the coating is obtained from a grinded Bi-2223/Bi-2212 mixed ceramic the R(T) curves are better (higher Tc and narrower ΔTc) than the R(T) curves obtained with the ceramic used for preparing the wires, for which Tc0 = 34K. The role of PbO in excess is discussed. These coatings hold rather well against corrosion by waper vapor at 90°C and the Bi-2223 phase is less corroded than the Bi-2212 phase. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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