Superconductive percolation in Bi-based superconductor/Bi-based insulator composites: case of Bi-2223/Bi-2310 and Bi-2212/BiFeO3
| Autor: | G. Vacquier, O. Monnereau, H. Faqir, H Nadifi, L. Tortet, C. Grigorescu, C. Boulesteix, A. Ouali |
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| Rok vydání: | 2000 |
| Předmět: |
Superconductivity
Materials science Composite number Metals and Alloys Sintering Percolation threshold Insulator (electricity) Dielectric Condensed Matter Physics Microstructure Electrical resistivity and conductivity Materials Chemistry Ceramics and Composites Electrical and Electronic Engineering Composite material |
| Zdroj: | Superconductor Science and Technology. 13:1174-1179 |
| ISSN: | 1361-6668 0953-2048 |
| Popis: | Preparation of Bi-2223/Bi-2310 and Bi-2212/BiFeO3 composites has been performed so as to obtain some active composites where the superconductive properties of Bi-2223 or Bi-2212 can be modified using a property of the insulating phase. In both cases superconductive percolation was obtained, but only in the case of a Bi-2223 (or Bi-2212)/Bi-2310 composite was no (or very weak) chemical reaction observed during sintering. Since the superconductive percolation threshold was obtained in this case for a concentration of Bi-2223 or Bi-2212 lower than 20%, a special composite model had to be considered. The Bi-2212/BiFeO3 system is very interesting due to the ferroic properties of BiFeO3. Superconductive percolation was achieved with this mixture too, but with more difficulties because of a chemical reaction occurring between the two compounds during sintering. A study of the properties of these composites has been performed and will be briefly described in what follows. The good quality of the Bi-2223(or Bi-2212)/Bi-2310 composite enables us to expect some future applications. |
| Databáze: | OpenAIRE |
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