Phase separation in (Bi,Pb)(2.2)Sr2CaCu2O8+delta single crystals at an annealing at high oxygen pressure

AB Kulakov, IK Bdikin, SA Zver'kov, GA Emel'chenko, Guang Yang, John Abell

Research output: Contribution to journalArticle


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 languageEnglish
Pages (from-to)45-51
Number of pages7
JournalPhysica C Superconductivity
Issue number1
Publication statusPublished - 1 Jun 2002


  • X-ray topography
  • single-crystal growth
  • Bi-2212
  • phase separation


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