Unusual High Oxidation State of Iodine Intercalated in the Bi2Sr2CaCu2Ox Superconductor

Jin Ho Choy, Seong Gu Kang, Dong Hoon Kim, Seong Ju Hwang, Mitsuru Itoh, Yoshiyuki Inaguma, Tetsuro Nakamura

Research output: Contribution to journalEditorialpeer-review


X-ray photoelectron spectroscopy (XPS) shows that iodine intercalated into the (Bi-O) layers of the oxide superconductor Bi2Sr2CaCu2Ox is present in a highly oxidized I(VII) state suggestive of the formation of strongly covalent I-O bonds as in KIO4, not as in KIO3. Electrons are transferred from the antibonding states of the covalent complex to the CuO2 sheets, which lowers Tc. The core-level spectra also show the presence of residual iodine species at the surface of the samples. Ar-ion sputtering of the surface disintercalates iodine from the bulk to the surface.

Original languageEnglish
Pages (from-to)284-287
Number of pages4
JournalJournal of Solid State Chemistry
Issue number1
Publication statusPublished - 1993 Jan

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry


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