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An interesting sol-gel route to prepare oxyfluoride Sr2CuO2F2+δ superconductors
- Source :
- Physica C: Superconductivity. 290:63-69
- Publication Year :
- 1997
- Publisher :
- Elsevier BV, 1997.
-
Abstract
- The oxyfluoride superconductor, Sr 2 CuO 2 F 2+δ , was prepared by a sol-gel method. Two different routes were examined; one was an attempt to prepare the Sr 2 CuO 2 F 2+δ phase directly from fluorine-containing sols, and the other was the fluorination of sol-gel-derived Sr 2 CuO 3 fine powders by F 2 gas. The former route did not lead to the formation of oxyfluorides because of the precipitation of SrF 2 by the heat treatments of the gel. The latter route led to the formation of the Sr 2 CuO 2 F 2+δ phase. The amount of the Sr 2 CuO 2 F 2+δ phase and superconducting properties of the powders depended on the fluorinating condition such as F 2 gas concentration and fluorinating time. The T c values reached 45–47 K by annealing the fluorinated samples in vacuo. The magnetization hysteresis loop was measured for the first time in the oxyfluoride superconductors.
Details
- ISSN :
- 09214534
- Volume :
- 290
- Database :
- OpenAIRE
- Journal :
- Physica C: Superconductivity
- Accession number :
- edsair.doi...........94938450ffd02301397169478840a6d3