The 130 K high-Tc superconductor in the system Bi-Sr-Ca-Cu-O doped with Sb and Pb
Abstract
The preparation procedure for a nearly pure 2223 high-Tc superconducting phase in the system Bi-Pb-Sb-Sr-Ca-Cu-O by is described together with its microstructure and superconductivity characteristics. The superconductor of the composition Bi(1.8)Pb(0.3)Sb(0.1)Sr2Ca2Cu3O(10-delta), which was obtained by solid-state reaction in air, showed semiconducting behavior at temperatures higher than 140 K. The electrical resistance of this phase begins to drop at 140, reaching zero at 92 K. The ac magnetic susceptibility curve shows two transitions (which were stable during cycling for three times from 77 K to room temperature): at 130 K and at 89 K. Results of TEM and SEM observations indicated distortion in the 2223 phase. It is suggested that these distorted 2223 crystals are responsible for the 130 K superconductivity.
- Publication:
-
Journal of Superconductivity
- Pub Date:
- June 1990
- DOI:
- 10.1007/BF00624506
- Bibcode:
- 1990JSup....3..183X
- Keywords:
-
- Bismuth Oxides;
- Copper Oxides;
- Doped Crystals;
- High Temperature Superconductors;
- Mixed Oxides;
- Strontium Compounds;
- Antimony Compounds;
- Calcium Oxides;
- Electrical Resistance;
- Lead Oxides;
- Transition Temperature;
- Solid-State Physics