Glass Physics and Chemistry

, Volume 36, Issue 4, pp 411–418 | Cite as

Charge states of atoms in ceramic superconductors HgBa2Can − 1CunO2n + 2, Tl2Ba2Can − 1CunO2n + 4, and Bi2Sr2Can − 1CunO2n + 4 (n = 1–3)

  • G. A. Bordovskii
  • A. V. Marchenko
  • F. S. Nasredinov
  • P. P. Seregin
Article

Abstract

The parameters of the electric-field-gradient tensor for copper sites in the HgBa2Can − 1CunO2n + 2, Tl2Ba2Can − 1CunO2n + 4, and Bi2Sr2Can − 1CunO2n + 4 (n = 1–3) lattices have been determined using 67Cu(67Zn) Mössbauer emission spectroscopy and calculated in the framework of the point-charge approximation. The agreement between the experimental and calculated parameters has been achieved under the assumption that the holes formed as a result of the decrease in the oxidation state of a part of the mercury, thallium, or bismuth atoms are distributed over the oxygen sites in the Cu-O or adjacent planes. It has been demonstrated that the oxidation state of cations can be controlled in high-temperature superconducting ceramic materials.

Key words

superconductors Mössbauer emission spectroscopy parameters of the electric-field-gradient tensor doping with the 67Cu isotope 

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Copyright information

© Pleiades Publishing, Ltd. 2010

Authors and Affiliations

  • G. A. Bordovskii
    • 1
  • A. V. Marchenko
    • 1
  • F. S. Nasredinov
    • 2
  • P. P. Seregin
    • 1
  1. 1.Herzen Russian State Pedagogical UniversitySt. PetersburgRussia
  2. 2.St. Petersburg State Polytechnical UniversitySt. PetersburgRussia

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