Preparation and properties of Pb- and V-doped Bi-based superconductors
| Autor: | K. Nováková, O. Smrčková, D. Sýkorová, P. Vašek |
|---|---|
| Rok vydání: | 1996 |
| Předmět: |
Superconductivity
Materials science Dopant Transition temperature Doping Metals and Alloys Analytical chemistry Condensed Matter Physics Magnetic susceptibility Lattice constant Electrical resistivity and conductivity Phase (matter) Materials Chemistry Ceramics and Composites Electrical and Electronic Engineering |
| Zdroj: | Superconductor Science and Technology. 9:761-765 |
| ISSN: | 1361-6668 0953-2048 |
| DOI: | 10.1088/0953-2048/9/9/009 |
| Popis: | The effect of the stochiometric replacement of Pb and Bi by V in the Bi - Sr - Ca - Cu - O system has been studied. The content of Bi, Pb and V in the was altered according to the formula: a + b + c = 4 (a = 2.6 - 3.6, b = 0 - 0.8, c = 0 - 0.6). The influence of the dopant on the properties of the samples was detected by XRD analysis, by the measurement of the electrical resistivity, critical current density and magnetic susceptibility. The increasing amount of V on account of Pb led to the decreasing content of the 2223 phase and to the deterioration of the superconducting properties. On the other hand, the samples with V substituting Bi in material with a constant concentration of Pb (b = 0.8) reveal improved intergrain boundaries and a large content of the 2223 phase. The XRD analysis confirmed a decrease of the lattice parameter c of the 2223 phase from 37.173 nm to 37.079 nm for increasing amount of V in these samples. An unknown phase detected on x-ray diffraction patterns (Cu ) was attributed to the presence of V. |
| Databáze: | OpenAIRE |
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