Observation of migrating superoxide species in YBa2Cu3(57Co)O7-δ

Nikolai Kopelev, Vladimir Chechersky, Jing Tian, Zoltan Homonnay, Yen Wei, Amar Nath

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1 Citation (Scopus)


The interaction of the migrating superoxide ion O-2 with the central cobalt-57 atom of the four coordinate species at the chain site is probed with the help of emission Mössbauer spectroscopy. The bond formation between 57Co and O-2 requires some thermal activation, and consequently the five-coordinate species is stable only above ∼ 350 K. The equilibrium shifts in its favor at higher temperatures, and the interconversion between the two species is completely reversible. The O-2 ion can either attach to cobalt end-on with one of the oxygen atoms or interact equivalently with both. The amount of the five-coordinate species formed seems to be limited by the availability of O-2. The interconversion ceases to occur after a prolonged thermal treatment of the YBa2Cu3(57Co)O7-δ pellet at 420°C under argon flow. All the interstitial oxygen species are presumably removed without any measurable loss of oxygen from the Cu-O chains.

Original languageEnglish
Pages (from-to)137-144
Number of pages8
JournalPhysica C: Superconductivity and its applications
Issue number1-2
Publication statusPublished - Apr 1 1992

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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