Abstract
We report the phase transformation resultant from annealing of Bi-2212 single crystals doped by Pb (Pbo(0.3) per formula unit) under elevated oxygen pressure. General T-c vs. p(O2) dependence plotted by us in the range 7 x 10(-6) to 115 atm demonstrates a sharp bend. This knee indicates the phase transformation at annealings under p(O2) > I atm. The Xray topography data suggest that in addition to the phase of Pb-type modulation (q = 0.131b*) this transformation gives rise to another phase of Bi-type modulation (q = 0.200b* + c*). This process is reversible. We observed on individual crystals the twinning system analogous to that known for La2-xSrxCuO4 crystals. (C) 2001 Elsevier Science B.V. All rights reserved.
| Original language | English |
|---|---|
| Pages (from-to) | 45-51 |
| Number of pages | 7 |
| Journal | Physica C Superconductivity |
| Volume | 371 |
| Issue number | 1 |
| Publication status | Published - 1 Jun 2002 |
Keywords
- X-ray topography
- single-crystal growth
- Bi-2212
- phase separation