Annealing characteristics and calcium doping effects in the superconducting Pb2CuSr2[Eu1-xCax]Cu 2O8+δ system

T. Karlemo*, M. Karppinen, L. Niinistö, J. Lindén, M. Lippmaa

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

6 Citations (Scopus)


Essentially single-phase samples of Pb2CuSr2[Eu1-xCax]Cu 2O8+δ have been investigated in a compositional range of x = 0.0-0.3. Annealing characteristics in oxygen and nitrogen atmospheres were systematically monitored by thermogravimetric measurements. Activation energies were determined for both the oxygen uptake and loss processes. The effect of Ca doping on the critical temperature was studied, and the Tc was found to be quite independent of the Ca content. The highest value of Tc = 74 K was measured for the sample of x = 0.25. The hyperfine parameters of the Eu site were determined by 151Eu Mössbauer spectroscopy. The asymmetry parameter η of the electric field gradient showed a clear dependence on both x and δ.

Original languageEnglish
Pages (from-to)225-232
Number of pages8
JournalPhysica C: Superconductivity and its Applications
Issue number3-4
Publication statusPublished - 20 Dec 1997
MoE publication typeA1 Journal article-refereed


  • Annealing
  • Kinetics
  • Mössbauer spectroscopy
  • Substitution effects

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