Abstract
The effect of different cooling procedures, after sintering, on the microstructural and superconducting properties of Bi2Sr2CaCu2Ox (B-2212) screen-printed tapes has been investigated. It was found that the amorphous phase originally present in grain boundaries at the sintering temperature undergoes a conversion to the Bi-2212 phase during slow cooling. However, the excess oxygen absorbed during slow cooling (in 21% oxygen) disturbs the order and ordering process of Bi-2212 crystals, but if the slow cooling process is conducted under monotonically reduced oxygen partial pressure, to ensure that the optimum oxidation state at sintering temperature of the Bi-2212 phase can be retained during the cooling procedure, tapes are then characterized by narrow grain boundaries and the highest J(c) value > 10(4) A/cm2 at 77 K and 0 T.
| Original language | English |
|---|---|
| Pages (from-to) | 833-835 |
| Number of pages | 3 |
| Journal | Applied Physics Letters |
| Volume | 63 |
| Issue number | 6 |
| Publication status | Published - 9 Aug 1993 |
Keywords
- TEMPERATURE
- BI2SR2CACU2O8+DELTA
- TRANSITION