| Autor: |
Aurel Pop, Rares Stiufiuc, Tzuen-Rong Yang, Gheorghe Ilonca, I. Gr. Deac, C. Lung, G. Stiufiuc |
| Rok vydání: |
2001 |
| Předmět: |
|
| Zdroj: |
International Journal of Inorganic Materials. 3:769-772 |
| ISSN: |
1466-6049 |
| DOI: |
10.1016/s1466-6049(01)00048-4 |
| Popis: |
The effect of partial replacement of Ca by Y, Er and Lu on the structural transport properties of (Bi 1.6 Pb 0.4 )(Sr 1.8 Ba 0.2 )(Ca 1− x R x ) 2 Cu 3 O y superconductors ceramics (0≤ x ≤0.03) have been investigated. The substitution of Y, Lu and Er at the Ca site induced the decrease of the volume fraction for the 2223 phase and the increase of the 2212 and 2201 phases volume fractions. In the normal state, all the samples are characterized by a linear temperature dependence of electrical resistivity and Hall concentrations. The rate of depression for the critical temperature in x =0.02 samples found to be nearly the same for all of these substitutions. The nature of T C suppression may be attributed to the increase of oxygen content in Bi 2 O 2 double layers with increasing Y, Lu and Er concentrations. The sample shows a linear dependence of intergranular temperature as a function of AC field amplitude, which is in agreement with the Muller critical state model. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect